Question

From above figure find x​

Answer 1

EXTERIOR ANGLE=SUM OF TWO OPPOSITE INTERIOR ANGLE

123°=56°+x

x=123-56

x=67

PROVE:

EXTERIOR ANGLE=SUM OF TWO OPPOSITE INTERIOR ANGLE

56°+x

56°+67°

123°

Answer 2

Answer:

in this triangle see

Angle ACD and angle ABC form linear pair

therefore angle therefore angle sum will be equal to 180

angle ABC + angle BCD equal to 180 degree now

see the picture

NOW WE KNOW SUM OF ALL ANGLES OF TRIANGLE IS = 180