In the Fig.5.7, we have ∠1 =∠2, ∠2 =∠3. Show that ∠1 =∠3.
Given, ∠1 = ∠2 …(i)
and ∠2 = ∠3 …(ii)
According to Euclid’s axiom, things which are equal to the same things are equal to one another.
From Eqs. (i) and (ii),
∠1 = ∠3