12. What kind of angle is ZH if it measures 90°?
A. acute
B. obtuse
C. right D. reflex
13. Which statement describes a right angle?
A. A right angle is an angle whose measure is 90°.
B. A right angle is an angle whose measure is 180º.
C. A right angle is an angle whose measure is greater than 0° but less than 90°.
D. A right angle is an angle whose measure is greater than 90° but less than
180°​