1/2 base x height

or 1/2bh

The sum of the lengths of the sides

P=3+4+5

Use Pythagorean theorum to find the sides of any

right triangle

A=S²

or

A=bh

Formula to find the area of a

rhombus

A=1/2d₁x d₂

_{(1/2 diagonal 1 x diagonal 2)}

Formula to find the area of a

rectangle

A=lw

(the same as bh)

Formula to find the area of a

parallelogram

Formula to find the area of a

trapezoid

Formula for finding the total interior angle measure of polygons

(n - 2) 180°, where n stands for the number of sides

Examples:

Triangle: (3 - 2) x 180 = 1 x 180 =180°

Quadrilateral: (4 - 2) x 180 = 2 x 180 = 360°

Pentagon: (5 - 2) x 180 = 3 x 180 = 540°

Hexagon: (6 - 2) x 180 = 4 x 180 = 720°

Heptagon: (7 - 2) x 180 = 5 x 180 = 900°

Octagon: (8 - 2) x 180 = 6 x 180 = 1,080°

Nonagon: (9 - 2) x 180 = 7 x 180 = 1,260°

Decagon: (10 - 2) x 180 = 8 x 180 = 1,440°

(n -2) 180°

n

where n stands for the number of sides (which is the same as the number of angles)

Pentagon:

(5 - 2) 180 = (3 x 180) = 540 = 108°

                      5                5             5

V = e³

all dimensions are equal in a cube.

l = w =h

these dimensions are called edges in a cube.

Formula for finding the

Volume of a rectangular solid

Formula for finding the Volume of a

cylinder

Formula to find the Total Surface Area (TSA) of a

cube

TSA of a cube = 6e²

or

TSA of a cube = 6 x edge²

Formula for finding the TSA of a

rectangular solid

Formula for finding the area of a

circle

Formula for finding the circumference of a

circle

2πr

or

πd