Archive for the 'area formula' Category

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 [...]

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.

What kind of activity could I use for memorizing the suraface area formula- SA= 2(pie) r(squared) + 2(pie)rh?

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 [...]

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.
♣♦

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. [...]

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 [...]

How could I show why the formula for the area of a parallelogram is A= b*h?

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 [...]

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 * [...]

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

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)