Question

find the measure of the fourth angle of a quadrilateral if it's three angles are 100degree, 75degree and 105degree​

Answer 1

100+75+105+x=360

280+x=360

x=360-280

x=80

hence prove

Step-by-step explanation:

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Answer 2

Answer:

Fourth angle = 80°

Step-by-step explanation:

The sum of all angles of a quadrilateral = 360°

Let the fourth angle be x

∴  100° + 75° + 105° + x = 360°

⇒ 280° + x = 360°

⇒ x = 360° - 280°

⇒ x = 80°

Therefore, the fourth angle measures 80° .

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