Question

Hwelp T^T pwease! 20 pts

Answer 1

Hello again Charlesbabegirl! :)

First of all, let's say that the sum of all internal angles of a triangle is always 180°

This means that if you add up angles A, B and C you get 180 but we should find first the value of x by setting up a proportion of this type:

A + B + C = 180

12x + 12 + 15 + 3x + 18 = 180

Move all the known terms (those that don't have x) to the right with changed sign.

12x + 3x = 180 - 12 - 15 - 18

15x = 135

Divide both terms by 15

x = 9

Then plug the value of x...

m∠A = 12(9) + 12 = 108+12 = 120°

m∠C = 3(9) + 18 = 27 + 18 = 45°

Hope I helped and let me know if I was right!