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Shapes
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Formula
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Rectangle :
Area = Length X Width
A = lw
Perimeter = 2 X Lengths
+ 2 X Widths
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Parallelogram :
Area = Base X Height
a = bh
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Triangle :
Area = 1/2 of the base X
the height
a = 1/2 bh
Perimeter = a + b + c
(add the length of the three sides)
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Trapezoid :
Perimeter = area + b1 +
b2 + c
P = a + b1 + b2 + c
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Circle :
The distance around the circle
is a circumference. The distance
across the circle is the diameter (d).
The radius (r) is the distance from
the center to a point on the circle.
(Pi = 3.14)
d = 2r
c = pd = 2 pr
A = pr2
(p=3.14)
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Rectangular Solid :
Volume = Length X Width
X Height
V = lwh
Surface = 2lw + 2lh + 2wh
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Prisms :
Volume = Base X Height
v=bh
Surface = 2b + Ph
(b is the area of the base P
is the perimeter of the base)
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Cylinder :
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Pyramid :
V = 1/3 bh
Surface Area: Add the area
of the base to the sum of the
areas of all of the triangular
faces. The areas of the triangular
faces will have different
formulas for different shaped
bases.
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Cones :
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Sphere :
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