Math Formulas for Shapes and Circles & Volume and Surface Area
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
