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

I have a perimeter and area test on Wednesday and I need to memorize the formulas for these shapes:

Rectangle:
Perimeter: (Base + Height) x 2
Area: Base x Height

Square:
Perimeter: side x 4
Area: side x side

Triangle:
Perimeter: Add 3 sides
Area: 1/2 x base x height

Parallelogram:
Perimeter: (Base + Slant Height) x 2
Area: Base x Height

Circle:
Perimeter: pi x diameter
Area: pi x radius squared

Rhombus
Perimeter: side x 4
Area: side x side

Irregular Shape:
Perimeter: Add all sides
Area: Divide into sections
Apply the apporate formula
Add together
I’m in grade 7 and these are the right formulas my teacher gave them to me.

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

This entry was posted on Friday, December 11th, 2009 at 11:04 pm and is filed under area formulas. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

7 Responses to “Is There Any Good Tips On How To Memorize The Perimeter And Area Formulas?”

  1. Sounds like you have it down to me
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  2. keep writing it down until you remember it
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  3. There is nothing else you need to do but actually remember what the formulas are. Good luck in your exam.
    References :

  4. michaelempeigne on December 12th, 2009 at 5:12 am

    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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  5. 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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  6. 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.
    References :

  7. 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

    References :

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