Equations of area and perimeter

Area of circle

A=πr²

Circumference of a Circle

C=2πr

Arc Length

arc length = (angle/360) * 2πr

Sector Area

area = (angle/360) * πr²

Area of a Rectangle

A=bh

Perimeter of a Rectangle

P=2l+2w

Area of a Square

A=s²

Perimeter of a Square

P=4s

Area of a rectangle

A=bh

Perimeter of a Paralellogram

A=2a+2b

Area of a Trapeziod

A=1/2(b1+b2)*h

Perimeter of a Trapezoid

P=a+b+c+d

Area of a Triangle

A= 1/2 bh

Perimeter of a Triangle

P=a+b+c

Area of a Regular Polygon

A = 1/2 a P (a is "apothem")

Perimeter of a Regular Polygon

P = n x s

Definition of a Regular Polygon

a polygon where all of the sides and angles are congruent

Outside angle

outside angle= (big-small/2)

Equation of circle

(x-h)² + (y-k)²=r²

Volume of cone

v= 1/3 (pi x r²) x H

Volume of cylinder

v= (pi x r²)h

volume of prism

V= Abase x h

Volume of sphere

V= 4/3 pi x r³

area of trapezoid

A= (b+b/2) h