Question

If the angles of a quadrilateral are x°, (x+20)°, (x+40)°, and (x+60)°, what is the value of x?

Options

• 40°

• 45°

• 50°

• 60°

Answer 1

60°

Explanation:

Adding angles gives x + (x + 20) + (x + 40) + (x + 60)

4x + 120 = 360

360 − 120

4x = 240

x = `240/4`

x = 60°