ACT Formulas

Area of a Square

A=l²

Area of a rectangle

A=l×w

Area of a parallelogram

A=l×h

Area of a triangle

2/1​b∗h

Area of a circle

A=πr²

Area of a sector, if the sector angle is s and the radius is r

A=(s/360)x(πr²)

Length of an arc if the arc angle is s and the radius is r

L=(s/360)x(2πr)

Circumference of a circle

C=2πr

Volume of a cylinder

V=πr²h

Volume of a cone

V=(1/3)πr²h

Volume of a sphere

V=(4/3)πr³

Volume of a cube

V=l³

Volume of a rectangular prism

V=lwh

Surface area of a cylinder

(2πr²)+(2πrh)

Surface area of a cone

(πr²)+(πr)∗(h²+r²)​

Surface area of a sphere

4πr²