Question

If angle 1 = angle 3 and angle 2 = angle 4 show that angleA= angleC

Answer 1

$let \: a = 1 \\ b = 2 \\ c = 3 \\ d = 4 \\ given - \\angle \:1 = angle \: 3 \\ therefore \: angle \: a = \: angle \: c \\ hence \: proved$