Question

Unknown angle problems (with algebra)

Answer 1

x = 20

Explanation:

100 + 3x + x = 180

100 + 4x = 180

- 100 -100

4x = 80

÷4 ÷4

x = 20

360° is a full circle, and since this is half you set the numbers equal to 180°

I hope this helps!