Question

find the unknown lettered angle:-​

Answer 1

sum of all interior angles of triangle is 180°

1]. 50+70+x=180

120 +×=180

×=180-120

×=60

2]. a+65+65=180

a+130=180

a = 180-130

a = 50

3)]. ×+×+×=180

3×=180

×=180÷3

×= 60

sum of two opposite interior angle is equal to exterior angle

4]. 50 + 70=×

120 = ×