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## Answers

The sum of the three angles of a triangle is always 180. So,

3x + 4x + 5x = 180

12x = 180

x = 15

So the three angles are

**45, 60, and 75.**

3x+4x+5x= 180 (which is the sum of the angles in a triangle)

12x= 180

x= 15

you got x, so here...

3(15)= 45

4(15)= 60

5(15)= 75

proof???

45+60+75=180

180=180