theorem of exterior angle class 9
FAISALNAZIR:
proof angle 4 +angle 2 is 180
and angle 1 +2+3=180
from 1 and 2 we get
angle 4 +and 2 =angle 1 +2+3
angle 2 and angle 2 cut
ANGLE 4=ANGLE 1 +ANGLE3
SRY
PROVE THAT ANGLE 4 =ANGLE 3
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