# In the Below Fig, Aoc is a Line, Find X. - Mathematics

In the below fig, AOC is a line, find x.

#### Solution

Since ∠ AOB and ∠BOC are linear pairs

∠AOB + ∠BOC = 180°

⇒70° + 2x° = 180°

⇒ 2x° = 180° - 70°

⇒ 2x = 110°

⇒ x 110/2

⇒ x = 55°

Concept: Pairs of Angles
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#### APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 10 Lines and Angles
Exercise 10.2 | Q 9 | Page 15