Question

One angle of a quadrilateral is 60° and the remaining three interior angles are equal. Find the measure of each of the remaining angles.​

Answer 1

Answer:

here is your answer :-

Step-by-step explanation:

given one angle is 60 and the remaining 3 interior angles are equal

let D = 60 and A =B = C be x

We know that the sum of interior angles of quadrilateral is 360

so A + B + C + D = 360

x+x+x+60 =360

3x + 60 =360

3x=360-60

3x=300

x =300/3

x=100

Therefore A = B = C = 100