Question

three angles of quadrilateral are 60° 120°70° find the forth​

Answer 1

Answer:

Step-by-step explanation:

So the measure of 4th angle=360-sum of other three angles. Sum of given three angles=60+80+120=260. Forth angle=360-260=100.

Step-by-step explanation:

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Answer 2

Answer:

since sum of all angles of quadrilateral measure 360°

Let the fourth angle be x

therefore, 60° + 120° + 70° + x = 360°

=> 250° +x = 360°

=> x = 110°

therefore fourth angle measures 110°