Question

In fig angle BCD is an exterior angle of angle ABC. If angle BCD=3x, angle A=x and angle B=80 degree. Find the value of x​

Answer 1

Answer:

the exterior angle is the sum of the opposite two angles of the triangle

3x = 80 + x

2x= 80

x=40

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Answer 2

answer=40

=x+ 40=3x

=x-3x= -80

=2x=-80

=x=80÷2

=x=40