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Step-by-step explanation:
Let AB and CD be the two parallel lines and EF be the transversal which intersects them at M and N respectively, such that there are two pairs of interior angles formed. These interior angles are ∠1,∠3 and ∠2,∠4
To prove:
∠1+∠3=180 or ∠2+∠4=180
Proof:
Ray ND stands on line EF,
∠3+∠5=180 eq.1 (linear pair of angles)
But ∠1=∠5 eq.2 (corresponding anglles as AB||CD)
From eq.1 and eq.2,
∠1+∠3=180 eq.3
Again ray CN stands on EF,
∠2+∠6 = 180 (linear pair of angles)
But ∠4=∠6 (corresponding angles as AB||CD)
∠2+∠4=180
Hence, it is proved that transversal intersects two parallel lines and each pair of interior angles are supplementary
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