Question

Triangle ABC is a right triangle.

What is the relationship between angles A and B?

They are congruent.
They are complementary.
They are supplementary.
There is no relationship between them

Answer 1

They are complementary because they add up to 90 degree.

Answer 2

we know that

In the right triangle of the figure

∠A+∠B=
`90\°` ------> by complementary angles

Verify

`59\°+31\°=90\°` -----> is correct

Angle A and Angle B are complementary angles

therefore

the answer is the option

They are complementary.