B. Directions: Read and solve the given problems. Encircle the letter of the best answer 1. A water pipe has a radius of 4 m and height of 12 m. Find its surface area? A. 602.88 m² B. 401.92 m2 C. 301.44 m² D. 100.48 m2 2. A birthday hat has a circular base of radius 9 cm and a slant height of 12 a cm. What is the formula to find its surface area? A. 4rr2 B. Arr + s) C. 682 D. 2nr (r + h) 3. What is the surface area of the birthday hat? A. 593.46 cm2 B. 678.58 cm C. 768.58 cm D. 876.58 cm 4. Last summer, Marian and Heart played with a beach ball on the seashore. The beach ball was in the shape of a sphere with radius of 9 inches. What was the surface area of the beach ball? What is asked in the problem? A. the shape of the beach ball C. the total number of the beach ball B. the area of the beach ball D. the surface area of the beach ball 5. What is the surface area of the beach ball? A. 173.36 in? B. 527 in 2 C. 1,017.36 in D. 1,273.36 in?​