Question

The sum of the measures of the angles below is 180*

Answer 1

x = 45

(2x-10) = 80

x+10 = 55

Explanation:

so, make an equation to find x:

x+2x-10+x+10 = 180

collect like terms

4x = 180 (divide both sides by 4)

x = 45

sub into the formulas:

x- 10 = 45+10 = 55

2 × 45 - 10 = 80

add them together to see if it is correct:

45 + 55 + 80 = 180