Question

three angle of polygon are 80° 70° and 120°. Find the fourth angle​

Answer 1

Answer:

Step-by-step explanation:

Because we know that the sum of all the angles of a quadrilateral is 360

NOW, let the fourth angle be x-----

so -

80+70+120+x=360

=270+x=360

=x=360-270

=x=90

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Answer 2

Answer:

Step-by-step explanation:

Sum of the angles of a polygon = 360 degree

80+70+120

= 270

270+x = 360

x= 360-270

x= 90 degree

Therefore, the fourth angle is 90 degree.

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