Question

Find the fourth angle of a quadrilateral whose angles are 90°, 45° and 60°​

Answer 1

Answer:

100°

Step-by-step explanation:

Sum of all the angles of a quadrilateral is 360.

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

Answer 2

Step-by-step explanation:

Sum of all the angles of a quadrilateral is 360. So the measure of 4th angle=360-sum of other three angles. Sum of given three angles=60+80+120=100degree