Answer: X + Y = 180° Step-by-step explanation: We know that vertical opposite angles are equal So, Angle A = Angle B So, Assume; Angle A = x So, Angle A + Y = 180° So, X + Y = 180° Log in to Reply

Answer:X + Y = 180°

Step-by-step explanation:We know that vertical opposite angles are equal

So,

Angle A = Angle B

So,

Assume;

Angle A = x

So,

Angle A + Y = 180°

So,

X + Y = 180°