Question

select the correct choice that completes the sentence below.
two angles, the sum of whose measures is $90^\circ$, are called $\boldsymbol{\
ule{1.5cm}{0.15mm}}$ angles.

Explanation:

In Geometry (a subfield of Mathematics), the definition of complementary angles is two angles whose sum of measures is \(90^\circ\). So the correct term to fill in the blank is "complementary".

Answer:

complementary