1. In the following figure, the value of x is

- Option : B
- Explanation : ∠CBA =180° -65°=115°. ∠DCB =180° -80°=100°. ∠EDC=1I5°. ∠A =90°. ∠DEA =540°. - (115°+ 100° + 115° + 90°) =120°. [sum of all angles 'in a pentagon is 540°]. ∠x = 180° -120°=60°

- Option : D
- Explanation : As, we know that

∠AOC+ ∠BOC = 180° (Linear Pair)

⇒ 50° + ∠BOC = 180°

⇒ ∠BOC = 180° - 50°

= 130°

4. The sum oflength oftwo sides of a triangle is always

- Option : B
- Explanation : Sum of length of two sides of a triangle is always greater than the third side.

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