Question

Question 1 (iii)
State the property that is used in each of the following statements:

If $\angle 4+\angle 5={180}^{\circ }$, then a||b.

Answer 1

Given, $\angle 4+\angle 5={180}^{\circ }$, then a||b
When a transversal cuts two lines, such that pairs of interior angles on the same side of the transversal are supplementary, the lines have to be parallel.