Question

The there angles of a quedrilateral are 60". 8O, 120.
Find the fourth angle​

Answer 1

Answer:

The fourth angle is 100

Step-by-step explanation:

sum of angles in a quadrilateral = 360

let the fourth angel be A

60+80+120+A = 360

A+260 = 360

A = 360 - 260

A = 100

Answer 2

Answer:

Let fourth angle be ꪎ

ꪎ + 60 + 80 + 120 = 360. { Angle Sum Property }

ꪎ + 260 = 360

ꪎ = 360 - 260

ꪎ = 100°