Question

Two angles of a quadrilateral measure 85ᵒ and 75ᵒ respectively. The other two angles are equal. Find the measure of each of these equal angles.

Answer 1

Total sum of angles of quadrilateral: 360
So, 85+75+x+x=360
2x+160=360
2x=200
x=100
ans) Each angle measures 100 degrees

Answer 2

Let the measure of equal angles be x.

So,

85 + 75 + x + x = 360

160 + 2x = 360

2x = 360 - 160

2x = 200

X = 200 / 2

X = 100

Each angle = 100°