Question

Find the value of r, with explanation

Answer 1

sum of all angles of pentagon = 540°
90°+110°+r°+140°+80° = 540°
420 °+r ° = 540°
r° = 120°

Answer 2

Clearly it is a pentagon

And the sum of angles in a pentagon is = 540 degrees

Therefore :

110 + 140 + 80 + 90 + r = 540

420 + r = 540

r = 540 - 420

r = 120

Hope it helps you.

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