Answer each question below. 18. The shadow cast by the obelisk is 52 feet long (78) while at the same time the angle of the sun from the horizon is 510. How tall is the 2 obelisk? 52 ft 19. Find the perimeter of the polygon. 20. If the linear measure of PQ is 13.5x , what is the (76) (85) radius of the circle? P 810 60 12 Q Calculate the area of each shaded region below. 21. Round your answer to two decimal places. 22. Give your answers in terms of IT . (94) (94) 80 O 12 Do each proof below. 23. Given: OPOR is a square inside OO. 24. Given: mRU = mST Prove: mDE = mFG Prove: mZSRU = mZRST R S E G T