# RS Aggarwal Solutions Class 7 Mathematics Solutions for Lines and Angles Exercise 13 in Chapter 13 - Lines and Angles

Question 2 Lines and Angles Exercise 13

Find the angle which is equal to its supplement.

Let the measure of the required angle be x^{0}.

Then,

\begin{array}{l} =x+x=180^{\circ} \\ =2 x=180^{\circ} \\ =x=180 / 2 \\ =x=90^{\circ} \end{array}

Hence, the required angle measures 90^{\circ}

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