Area List » area formula http://www.thearealist.com Mon, 12 Jul 2010 11:15:05 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 What is the formula for finding the area of a Quadrilateral? http://www.thearealist.com/area-formula/what-is-the-formula-for-finding-the-area-of-a-quadrilateral http://www.thearealist.com/area-formula/what-is-the-formula-for-finding-the-area-of-a-quadrilateral#comments Sat, 19 Jun 2010 11:38:29 +0000 admin http://www.thearealist.com/area-formula/what-is-the-formula-for-finding-the-area-of-a-quadrilateral Ok so I need to know this. You know how the area of a triangle is 1/2basexheight I need to find some formula like that.

The formula for the area of an arbitrary quadrilateral is

√[(a+b+c-d)(a+b-c+d)(a-b+c+d)(-a+b+c+d) - 16 abcd cos(q)^2]

where q is half the sum of two opposite angles. For a cyclic
quadrilateral the each pair of opposite angles sums to pi, so it
reduces to Brahmagupta’s formula as under.

√[(a+b+c-d)(a+b-c+d)(a-b+c+d)(-a+b+c+d)].

[Brahmgupta was the Indian mathematician born in 598 A.D. who gave the formula for area of a cyclic quadrilateral.]

Edit:
a, b, c and d are the lengths of the sides of the quadrilateral.

]]> http://www.thearealist.com/area-formula/what-is-the-formula-for-finding-the-area-of-a-quadrilateral/feed 5 Who created the formula for Lateral Area? http://www.thearealist.com/area-formula/who-created-the-formula-for-lateral-area http://www.thearealist.com/area-formula/who-created-the-formula-for-lateral-area#comments Wed, 16 Jun 2010 11:04:22 +0000 admin http://www.thearealist.com/area-formula/who-created-the-formula-for-lateral-area I need to know the history and who created the formula for lateral area. (LA = Perimeter of base x Height) Please help me !

Surely the ancient Greeks knew this 2000 years ago. Check in Euclid.

]]> http://www.thearealist.com/area-formula/who-created-the-formula-for-lateral-area/feed 1 What kind of activity could I use for memorizing the suraface area formula- SA= 2(pie) r(squared) + 2(pie)rh? http://www.thearealist.com/area-formula/what-kind-of-activity-could-i-use-for-memorizing-the-suraface-area-formula-sa-2pie-rsquared-2pierh http://www.thearealist.com/area-formula/what-kind-of-activity-could-i-use-for-memorizing-the-suraface-area-formula-sa-2pie-rsquared-2pierh#comments Mon, 31 May 2010 04:39:21 +0000 admin http://www.thearealist.com/area-formula/what-kind-of-activity-could-i-use-for-memorizing-the-suraface-area-formula-sa-2pie-rsquared-2pierh
I think of it as cutting the ends off the can and then slicing through the rest of the can so it can be laid out flat to form a rectangle. The area of the circular ends is pir^2 each and the area of the rectangle is LW where the width is the height of the can, h, and the length is the circumference of the can 2pi r.

]]> http://www.thearealist.com/area-formula/what-kind-of-activity-could-i-use-for-memorizing-the-suraface-area-formula-sa-2pie-rsquared-2pierh/feed 1 What is the name of the geometric figure of a blimp, and what is the area formula? http://www.thearealist.com/area-formula/what-is-the-name-of-the-geometric-figure-of-a-blimp-and-what-is-the-area-formula http://www.thearealist.com/area-formula/what-is-the-name-of-the-geometric-figure-of-a-blimp-and-what-is-the-area-formula#comments Sat, 22 May 2010 18:46:53 +0000 admin http://www.thearealist.com/area-formula/what-is-the-name-of-the-geometric-figure-of-a-blimp-and-what-is-the-area-formula
the volume of an ellipsoid is: 4 π a b c / 3.

♣♦

]]> http://www.thearealist.com/area-formula/what-is-the-name-of-the-geometric-figure-of-a-blimp-and-what-is-the-area-formula/feed 1 Is there a determinant triangle area formula that works in 3D? http://www.thearealist.com/area-formula/is-there-a-determinant-triangle-area-formula-that-works-in-3d http://www.thearealist.com/area-formula/is-there-a-determinant-triangle-area-formula-that-works-in-3d#comments Wed, 19 May 2010 15:55:58 +0000 admin http://www.thearealist.com/area-formula/is-there-a-determinant-triangle-area-formula-that-works-in-3d We know that for a triangle in 2d, area =
| 0.5 0.5 0.5 |
| x_1 x_2 x_3 |
| y_1 y_2 y_3 |
Is there a similar formula for triangles in space, with points given as (x,y,z) coordinates?

The 2d determinant formula generalizes in 3d to a determinant formula for the volume of a tetrahedron. I do not know one for area of a triangle whose vertices are in (x,y,z) coordinates. But possibly someone else knows of something.

]]> http://www.thearealist.com/area-formula/is-there-a-determinant-triangle-area-formula-that-works-in-3d/feed 1 what is the formula for surface area of a triangular prism ? http://www.thearealist.com/area-formula/what-is-the-formula-for-surface-area-of-a-triangular-prism http://www.thearealist.com/area-formula/what-is-the-formula-for-surface-area-of-a-triangular-prism#comments Sat, 08 May 2010 09:43:18 +0000 admin http://www.thearealist.com/area-formula/what-is-the-formula-for-surface-area-of-a-triangular-prism I am in grade 7 and i was wondering what the formula for surface area of a triangular prism. thx ( and please explain it easily )

A triangular prism is a 3-dimentional object with 2 triangular bases and three rectangles connecting the bases.

Find the area of the triangle A = bh/2, but there are two triangles so multiply by 2.

Now consider a net. Imagine opening the prism and flattening it out. You should be given the length in the problem. The question is what is the width. The width is actually equal to the perimeter of the triangle. Calculate the perimeter of the triangle (or any base geometric object) and multiply it by the length. That will give you the lateral area. Add that to the two bases and get total area.

]]> http://www.thearealist.com/area-formula/what-is-the-formula-for-surface-area-of-a-triangular-prism/feed 1 How could I show why the formula for the area of a parallelogram is A= b*h? http://www.thearealist.com/area-formula/how-could-i-show-why-the-formula-for-the-area-of-a-parallelogram-is-a-bh http://www.thearealist.com/area-formula/how-could-i-show-why-the-formula-for-the-area-of-a-parallelogram-is-a-bh#comments Sat, 24 Apr 2010 02:15:34 +0000 admin http://www.thearealist.com/area-formula/how-could-i-show-why-the-formula-for-the-area-of-a-parallelogram-is-a-bh Knowing the formula for the area of a rectangle, how could I show why the formula for the area of a parallelogram is A= b*h?
by the way I am 13 so try not to use complicated language! thanx :)

Cut a triangle off of the parallelogram… so that the parallelogram becomes a right trapezoid and the triangle is also a right angled triangle. Add that triangle back onto the right trapezoid on the other side, so that they become a rectangle.

This is a simple geometric illustration. Area is perfectly preserved. b stays b, the base of the rectangle is the base of the parallelogram. But h goes from being the height of the parallelogram to being the width of the rectangle.

]]> http://www.thearealist.com/area-formula/how-could-i-show-why-the-formula-for-the-area-of-a-parallelogram-is-a-bh/feed 2 What is the formula for the surface area of a rectangular pyramid? http://www.thearealist.com/area-formula/what-is-the-formula-for-the-surface-area-of-a-rectangular-pyramid http://www.thearealist.com/area-formula/what-is-the-formula-for-the-surface-area-of-a-rectangular-pyramid#comments Thu, 22 Apr 2010 02:21:26 +0000 admin http://www.thearealist.com/area-formula/what-is-the-formula-for-the-surface-area-of-a-rectangular-pyramid I don’t want u to explain to me how to do it. But please just give me the FORMULA of the surface area of a rectangular prism. Please (:
And the volume formula please.

The volume of a pyramid:
V(volume) = 1/3 * Area of the base * Height

The surface area of a pyramid:
SA(surface area) = [1/2 * Perimeter * Slant Height] + [Base Area]

i would like you to follow the link below and click Problem 2 that is exactly same with your question.
http://www.brightstorm.com/d/math/s/geometry/u/area/t/surface-area-of-pyramids

]]> http://www.thearealist.com/area-formula/what-is-the-formula-for-the-surface-area-of-a-rectangular-pyramid/feed 2 What is the SURFACE AREA formula for a triangular pyramid? http://www.thearealist.com/area-formula/what-is-the-surface-area-formula-for-a-triangular-pyramid http://www.thearealist.com/area-formula/what-is-the-surface-area-formula-for-a-triangular-pyramid#comments Thu, 08 Apr 2010 03:32:38 +0000 admin http://www.thearealist.com/area-formula/what-is-the-surface-area-formula-for-a-triangular-pyramid i believe it is a triangular pyramid. all sides and the base are triangles so if it something else, please tell me.

Just find the area of all of the triangles, then add it up

]]> http://www.thearealist.com/area-formula/what-is-the-surface-area-formula-for-a-triangular-pyramid/feed 2 How to calculate area of a pyramid? – the formula please =)? http://www.thearealist.com/area-formula/how-to-calculate-area-of-a-pyramid-the-formula-please http://www.thearealist.com/area-formula/how-to-calculate-area-of-a-pyramid-the-formula-please#comments Fri, 26 Mar 2010 22:36:38 +0000 admin http://www.thearealist.com/area-formula/how-to-calculate-area-of-a-pyramid-the-formula-please Hey i need to know how to do the formula to get the area of a pyramid

http://en.wikipedia.org/wiki/Pyramid_(geometry)

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