Question

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



What is the measure of angle TSU?

Answer 1

Since angle RST is a right angle, it has a measure of 90°.
Angle RSU could either be inside or outside the right angle.
If Angle RSU is inside, the measurement of Angle TSU is:
90°- 25° = 65°

If Angle RSU is outside, the measurement of Angle TSU is:
90° + 25° = 115°

Answer 2

`\angle RST=90^(\circ)\\\\ \angle RSU=25^(\circ)\\\\ \angle RST=\angle RSU+\angle TSU\\\\ \rightarrow 25^(\circ)+\angle TSU=90^(\circ)\\\\ \rightarrow \angle TSU=-25^(\circ)+90^(\circ)\\\\\angle TSU=65^(\circ)`