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Geometry Formulas
formulas for 2d and 3d shapes
20
Mathematics
8th Grade
02/07/2012
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Term
Area of a rectangle
 Definition
A = lw or bh
Term
Area of a parallelogram
 Definition
A = bh
Term
Area of a triangle
 Definition
A = 1/2(bh) or (bh)/2
Term
Area of a trapezoid
 Definition
A = 1/2(b1 + b2)h
Term
Area of a circle
 Definition
A = Πr2
Term
Circumference of a circle
 Definition
C = dΠ or 2rΠ
Term
Volume of a rectangular prism
 Definition
V = lwh
Term
Volume of a triangular prism
 Definition
V = (bh/2)h  or lwh/2
Term
Volume of cylinder
 Definition
V = Πr2h
Term
Volume of a pyramid
 Definition
V = 1/3(Bh)
Term
Volume of a cone
 Definition
V = 1/3(Πr2h)
Term
Volume of sphere
 Definition
V = 4/3(Πr3)
Term
Surface area of prism
 Definition
S = 2B + Ph
Term
Surface area of cylinder
 Definition
S = 2Πr2 + 2Πrh
Term
Surface area of regular pyramid
 Definition
S = B + 1/2(Pl)
Term
Surface area of a cone
 Definition
S = Πr2 + Πrl
Term
Surface area of a sphere
 Definition
S = 4Πr2
Term
What does B stand for in all of the formulas that we use?
 Definition
It is the area of one base.
Term
What does P stand for in the formulas that we use?
 Definition
Perimeter of the base of the prism or pyramid.
Term
What does l stand for in the formulas that we use?
 Definition
The slant height of a pyramid or cone.
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