Question

4. Three angles of a quadrilateral are equal to 100°, 60 and 80 respectively.
Find its fourth angle.​

Answer 1

Answer:

Step-by-step explanation:

let the fourth angle be x

first angle = 100°

second angle = 60°

third angle = 80°

by angle sum property of quadrilaterals

100 + 60 + 80 + x = 360°

240 + x = 360

x = 360 - 240

x = 120°