Comments on: Is There Any Good Tips On How To Memorize The Perimeter And Area Formulas?

By: C H

C H — Sat, 12 Dec 2009 11:44:59 +0000

There was an ant named Peri who only walks around the object.
just add up the edges ,what-ever the shape.

the area equations ,need to memorize.

Circle:
Perimeter: pi x diameter

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By: xtempore

xtempore — Sat, 12 Dec 2009 11:39:59 +0000

Out of all of these you shouldn’t need to "memorise" anything except for the circle.

Just remember them as written…
PI-DEE (perimeter)
PI AR SQUARED (area)

The others are all pretty obvious.

Perimeters are just the sum of all the sides.

Areas of squares, rectangles, rhombuses, and parallelograms can all be summarised as base x height.

And the area of a triangle is just half base x height.

I would suggest that UNDERSTANDING perimeters and areas will serve you much better than MEMORISING.

It may be helpful to look at the proof of WHY a triangle’s area is 1/2 base x height. I’ll try to find a page with the proof, which is very simple.
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By: freond1

freond1 — Sat, 12 Dec 2009 11:00:59 +0000

I always found the formulas pretty simple, so memorizing them was not a big issue. By the way, the formula you have the the area of a rhombus is wrong. It's the product of the diagonals, not the sides.
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By: michaelempeigne

michaelempeigne — Sat, 12 Dec 2009 10:12:59 +0000

your formulas are not right for most of them.

Rectangle: A = Lw
P = 2(L + w)

Square: A = s^2
P = 4s

Circle: C = pi*d or 2pi*r
A = pi*r^2

Parallelogram: A = bh, h is the perpendicular height; not the slant height.
P = a + b + c + d

Triangle: A = (1 /2)bh, although there are alternate formulas.
P = a + b + c

Area of regular polygon = (1 / 2)perimeter* apothem

Rhombus: A = d1 * d2
P = 4s

I do have a way to remember them.
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By: Pointy

Pointy — Sat, 12 Dec 2009 09:51:59 +0000

There is nothing else you need to do but actually remember what the formulas are. Good luck in your exam.
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By: Air Force

Air Force — Sat, 12 Dec 2009 09:25:59 +0000

keep writing it down until you remember it
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By: FangPawnFire

FangPawnFire — Sat, 12 Dec 2009 09:19:59 +0000

Sounds like you have it down to me
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