### Home > MC1 > Chapter 8 > Lesson 8.3.2 > Problem 8-94

8-94.

Since we know that the angles of a triangle add together to 180° and that the right angle is 90°, we know that 25° + 90° + *y* = 180°.

This is the same as saying that 115° plus the value of *y* adds up to 180°. What must be the measure of angle *y*?

180° − 115° = 65°

65°

Follow the same steps as in part (a). Remember that the sum of the angles of a triangle is 180°.