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According to Euclid’s fifth postulate, write the pair of angles, having sum less than 180°.

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∠ 1, ∠ 2

∠ 2, ∠ 3

∠ 3, ∠ 4

∠ 1, ∠ 4

answer is B.

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Detailed Solution

Given is a figure,
Question Image

We know that a straight-line segment can be drawn joining any two points.
If two lines are drawn which intersect a third in such a way that the sum of the inner angles on one side is less than two right angles,

∠ 2 + ∠ 3 < 1800

The pair of angles have sum less than 180° is

∠ 2, ∠ 3

Therefore, option (2) is correct.

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