Question

One angle in a right triangle measures 57°. What is the measure of the other acute angle? 90° 33° 123° 43°

Answer 1

Acute angles are less than 90 degrees. So we can rule out 90 and 123. We also have the clue that it is a right triangle. Therefore we know two angles and can use the following equation to find the answer. 

90+57+x=180

147-147+x=180-147

x=33

Therefore the answer is 33 degrees. Your welcome ;)

Answer 2

The angles in a triangle always add up to 180°.

Because the triangle is a right triangle, we know that one of the three angles is 90°.

180 - 90 = 90, so the two acute angles must also add up to 90°.
90 - 57 = 33, so for all the angles to add up to 180°, the other acute angle must be 33°

Your answer is 33°
Hope this helps!!