Question

draw two parallel lines and transversal using color pencil Highlight the co-interior angles using gum art paper in different colors cut and paste the co-interior angles to see that each pair of co-interior angles form linear pair.

Answer 1

Answer:

In the below figure

∠c and ∠d are co-interior angles

and

∠r and ∠b are co-interior angles

Thus

∠r + ∠b = 180°

and

∠c + ∠d = 180°

So sum of interior angles is 180°

I hope it help full