Question

three angles of a quadrilateral are 55°,70° and 85°. find the fourth angle

Answer 1

Sum of all the angles on a quadrilateral = 360°

so,

= 360-(55+70+85)
= 360-210
= 150°

Fourth angle is 150°

Answer 2

Let the fourth angle be x

55°+70°+85°+x=360° (Angle Sum Property of quadrilateral)

x=360°-210°

x=150°

Therefore, the fourth angle is 150°...