Math Formulas for Shapes and Circles & Volume and Surface Area

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Formula for perimeter of a rectangle

add all four sides P = 2L + 2W

Formula for circumference of a circle

2πr or diameter x 3.14

Formula to find circumference if you know the diameter

3.14 (pi) x diameter

chord of a circle

A segment whose endpoints are on a circle

finding radius if you know the area

Area divided by 3.14 = radius squared. Now find the square root.

Volume

The amount of 3-dimensional space an object occupies. OR the amount of space inside of an object

Circumference

The distance around a circle

Area

The number of square units required to cover a surface.

Surface area

The total area of the surface of a three-dimensional object.

edge

a line segment that joins two vertices (on the boundary or where faces meet).

Formula for area of a triangle

base x height divided by 2

Formula for finding diameter of a circle if you know the circumference

circumference divided by 3.14

area of circle if you have diameter

diameter divided by 2 ---->radius x radius x 3.14

face

flat surface of a three-dimensional shape.

radius of a circle

is the line segment connecting the center of the circle to any point on the circle

Formula for area of a rectangle

length x width

diameter of a circle

the distance across the circle through its center point

Formula for area of a circle

πr²


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