Shape

Perimeter Formula

Area Formula

Explanation

Square

S₁+S₂+S₃+S₄

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or

4S

A=l * w

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A=S²

All sides are equal.

Rectangle

2l + 2w

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or 2(l +w)

or l + l + w + w

A=l * w

2 pairs of equal opposite parallel sides.

Triangle

S₁+S₂+S₃

A = 1/2bh

b=base

h=height

The base & height are perpendicular. 2 triangles placed together form a parallelogram.

Parallelogram

S₁+S₂+S₃+S₄

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A=b*h

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The base & height are perpendicular.

Circle

Circumference

2πr or πd

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r=radius

d=diameter

A=πr²

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π=3.14 or 22/7

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Shape

Surface Area

Volume=Bh

B=area of the base

Triangular Prism

ADD UP ALL THE AREAS OF THE SURFACES OR:

2(area of base) + (perimeter of base)h

SA = 2B + Ph

SA =2(1/2bh) + (a+b+c)h

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A triangular prism always has 2 triangular bases/faces and 3 rectangular faces.

V=Bh

B=1/2bh

So

V=(1/2bh)h

1^st h is the height of the triangle, 2^nd h is the height of the prism

Rectangular Prism

ADD UP ALL THE AREAS OF THE SURFACES OR:

​

SA = 2B + Ph

2(lw) + (a+b+c+d)h

V=Bh

B=lw

V=lwh

Cylinder

ADD UP ALL THE AREAS OF THE SURFACES OR:

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2(area of base) + (area of the rounded rectangle)

SA = 2B + Ph

SA = 2πr² + 2πrh

V=Bh

B=πr²

V=πr²h

Square Pyramid

ADD UP ALL THE AREAS OF THE SURFACES OR:

area of base + 4(area of other triangular faces)

​

SA= lw + 4(1/2bh)

V=1/3Bh

B=s²

V=1/3s²h

Cone

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V=1/3Bh

B=πr²

V=1/3πr²h