Question

How I get x for number 7

Answer 1

x = 50

Explanation:

Angles of a triangle add up to 180°. So the third angle of the triangle on the right is:

180° − 43° − 57° = 80°

Vertical angles are congruent, so the angle on the other side is also 80°. Therefore:

x° + x° + 80° = 180°

2x° = 100°

x = 50