Question

Angle RST is a right angle. Angle RSU has a measure of 25°.

What is the measure of angle TSU?

25°

45°
65°
75°

Answer 1

65°

Step-by-step explanation:

In any triangle, the sum of the three internal angles makes 180°.

In this problem, we have a right triangle, which means that one angle is 90°. We are also told that another angle is 25°, so if we call x the unknown angle, we must have:

90° + 25° + x = 180°

Re-arranging the equation, we can solve to find the value of x:

x = 180° - 90° - 25° = 65°