1.

In the figure, the value of x is A) 90° B) 60° C) 120° D) 20°

Answer»

Correct option is (D) 20°

\(\because\) Both angles 6x and 3x form a linear pair.

\(\therefore\) 6x+3x = \(180^\circ\)

\(\Rightarrow\) 9x = \(180^\circ\)

\(\Rightarrow\) x = \(\frac{180^\circ}9\) = \(20^\circ\)

Correct option is  D) 20°



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