Question

Give the value of x .

A. 60 degrees
B. 180 degrees
C. 120 degrees
D. 45 degrees

Answer 1

x=120°

Explanation:

sum of all angles in a triangle is equal to 180

let the unknown angle be

`\alpha`

`60 + 60 + \alpha = 180 \\ \alpha = 180 - 60 - 60 \\ \alpha = 60 \\`

`\alpha + x = 180 \\ x = 180 - \alpha \\ x = 180 - 60 \\ x = 120`