# Chapter 1 - Section 1.1 - Angles, Degrees, and Special Triangles - 1.1 Problem Set: 12

$90^{\circ}$ is neither acute nor obtuse angle. It is a right angle. Complement of $90^{\circ}$ = $0^{\circ}$ Supplement of $90^{\circ}$ = $90^{\circ}$

#### Work Step by Step

$90^{\circ}$ is a right angle as angles that measure $90°$ are called right angles. Complement of $90^{\circ}$ = $90^{\circ} - 90^{\circ}$ = $0^{\circ}$ (As sum of the measures of complementary angles is 90 degrees, we can find 'one' by subtracting 'other' from $90^{\circ}$ ) Supplement of $90^{\circ}$ = $180^{\circ} - 90^{\circ}$ = $90^{\circ}$ (As sum of the measures of supplementary angles is 180 degrees, we can find 'one' by subtracting 'other' from $180^{\circ}$)

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