27 formuals for act prep

Area for Square

Length times width

Side²

4 sides all same length

360 degrees

Area for Rectangle

Length times width

4 sides, two longer

360 degrees

Area for triangle

Length times width divided by 2 or length times width (1/2)

180 degrees

equilateral triangle

All sides are the same

Right triangle

Right angle

Use pyth. Theorem

SOH CAH TOA

Isosceles triangle

2 sides are equal

Scalene triangle

All sides are different

Circle area

pi(r²)

Circumference of a circle

2(pi)r

Radius

One half diameter

Diameter

Cuts the circle in half

Degrees of circle

360

Trapezoid

)B1 + B2/2)h Base- parallel lines

Pythagorean theorem

a²+b²=c² c²- longest side or hypotenuse

Pyth. Triplets

3,4,5

5,12,13

Parallelogram

Length times width

4 sides, 2 sets of parallel lines

Mean

Average; add up all numbers and divide by how many

Median

Center number in ascending order

Mode

Most frequent or repeating number

Midpoint

x1+x2/2 , y1+y2/2

Slope formula

Rise over run

y2-y1/x2-x1

Slope intercept

y=mx+b

PEMDAS

Parentheses

Exponents

Mult

Div

Add

Sub

Parallel lines

Same slope

Perpendicular lines

Opposite + reciprocal slope

Exponent rules

a³ times a^6 = a^9 - add exponents

a³ divided by a^6 = a^-3 - subtract exponents

(a³)^6 = a^18

Sin, tan, con

SOH CAH TOA

4 trig problems and 2 you just use SCT