Formulas to know: CHAPTER 8

Slope formula

y2-y1

m = —-—-

x2-x1

Distance formula

d = √(x₂ - x₁)² + (y₂ - y₁)²

Sum of all interior angles

180(n-2)

Sum of one interior angle

180(n-2)

-————

n

Sum of all exterior angles

360

Sum of one exterior angle

360

———

n

Length of trapezoid middle segment

b1 + b2

————

2

*To find the sum of the measures of the interior angles with the measure of one exterior angle

find number of sides (360/ex angle), then plug number of sides into 180(n-2)