Question

In the following image m angle 1= 117

Answer 1

its 63

Explanation:

180* is the whole degree for (1-2)

so 180-117=63

Answer 2

m∠3 = 63°

Explanation:

Linear pair: If in adjacent angles, the non common arms form a line, then they are called linear pair.

∠1 + ∠5 = 180 {linear pair}

117 + ∠5 = 180

∠5= 180 - 117

∠5 = 63°

If l₁ // l₂, then alternate interior angles should be congruent.

∠3 = ∠5

∠3 = 63°