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

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Solution

Concept: 0.5 Mark
Application: 0.5 Mark

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

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

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

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

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