Keywords
complementary angles, right angle
we know that
If two angles are complementary angles, then their sum is equal to a right angle
In this problem
\(Angle\ RSU+Angle\ TSU=90\°\) -------> by complementary angles
we have
\(Angle\ RSU=25\°\)
Substitute and solve for Angle TSU
\(Angle\ TSU=90\°-25\°=65\°\)
therefore
the answer is the option
\(65\°\)
