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To prove : ‘l’ ∥ ‘m’

Proof: ‘l’ ∥ ‘n’

⇒ ∠1= ∠3 (Pair of corresponding angles ) ………….(1)

Again, m’ ∥ ‘n’

And ∠2 = ∠3 (Pair of corresponding angles ) …………..(2)

From equation (1) and (2),we get

∠1 = ∠2

But they are forming a pair of corresponding angles.

‘l’ ∥ ‘m’ (By corresponding angles axiom) (Proved)

Example-1

Find ∠DGH.

Solution
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