Question

Find the measure of an angle which forms a pair of supplementary angles with itself. [1 MARK]

Answer 1

Concept: 0.5 Mark
Application: 0.5 Mark

Let the measure of the angle be $x^{\circ }$.

$\Rightarrow x^{\circ }+x^{\circ }={180}^{\circ }$

$\Rightarrow 2x^{\circ }={180}^{\circ }$

$\Rightarrow x^{\circ }={90}^{\circ }$