Question

what is angle 1 and 4 are called.and if 1 angle is 80 degree than are all angles equal ?​

Answer 1

Answer:

Suppose Angle 2 = 80°

Then angle 4 = 80° (Vertically opposite angles)

Now angle 1 + angle 4 = 180° (Linear pair)

i.e angle 1 = 180 - 80(angle 4) = 100°

Then angle 3 = 100°(angle 1) {Vertically opposite angles}

Hence proved.

Step-by-step explanation:

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Answer 2

Answer:

angle 1= 80°

angle 1=angle 3=80°

angle 1+angle 3=160°

=[angle of all sides(360°)]-[angle 1+angle 3 (160°)]

=200°

»200°/2 = angle 2 = angle 4

»100° = angle 2 = angle 4