Question

How many acute angles can a right triangle have?

Answer 1

Two

Explanation:

A right triangle can, and must, have exactly two acute angles.
To see this, just remember that the sum of the angles of a triangle must be `180^@`. As a right triangle has one angle equal to `90^@`, this means the sum of the remaining two angles must be `180^@-90^@ = 90^@`.
Thus, both of the remaining two angles must have a measure less than `90^@` and therefore must be acute.