Question 994231
let angles be {{{alpha}}} and {{{beta}}}

When two angles add to {{{90}}}°, we say they "complement" each other, or they are complementary angles

so, {{{alpha+beta=90}}}°

if  angles are equal, means {{{beta=alpha}}} and we have

{{{alpha+alpha=90}}}°

{{{2alpha=90}}}°

{{{alpha=90/2}}}°

{{{alpha=45}}}°=> means {{{beta=45}}}°

the measure of each is {{{45}}}°