Question

answer it step by step plz​

Answer 1

the fourth angle is 100°

Explanation:

Let the fourth angle be x.

Then,

angle sum property of quadrilateral,

60° + 80° + 120° + x = 360°

260° + x = 360°

x = 360° - 260°

x = 100°

Answer 2

Given:
Measures of the angles = 60, 80, 120
Let the unknown angle be = x

60 + 80 + 120 + x = 360 [ sum of interior angles of a quadrilateral is 360]
260 + x = 360
x = 360 - 260
x = 100


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