Lesson 2: 30° -60° - 90° Right Triangle Theorem What's More. Show your solution at the back or on a separate sheet of paper. Find the missing measures. Given: A PRQ is a 30° -60° - 90° triangle. 1. If PQ = 8, find RQ and PR. Answer: RQ = and PR = 2. IfRQ = 21, find PQ and PR. Answer: PR = and PR - and PQ = 3. If PR = 26, find RQ and PQ. 4. If PQ = 472 find RQ and PR Answer: RQ= Answer: RQ = and PR=