Answer
$ 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 $180^{\circ}$)
