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# In which diagram do angles 1 and 2 form a linear pair?

Linear pairs form a straight angle (180 degrees) when they are put together.

## Answer: angle1 and 2 in option b forms a linear pair.

Angle 1 and Angle 2 are a linear pair, if Angle 1 + Angle 2 = 180^{o}

**Explanation:**

Two angles are said to form a linear pair if they add up to 180 degrees.

(a) 50^{°} + 40^{°} = 90^{°}

Since the sum of angles is not equal to 90^{°}, the angles 50^{°} and 40^{°} do not form a linear pair.

(b) 79^{°} + 101^{°} = 180^{°}

Since the sum of angles is equal to 180^{°}, the angles 79^{°} +and 101^{° }form a linear pair.

### So, the angles in part (b) form a linear pair.

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