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### High School Mathematics4.11 Surface Area of a Sphere - III

 Example: The surface area of a sphere is 154 Sq. cm. Find its radius. Solution: Given that, Volume of the sphere = 154 Sq. cm. i.e., 4 * pi * r2 = 154 r2 = 154 * 7/22 * 1/4 r2 = 1078/88 r2 = 12.25 r = 3.5 cm. Directions: Solve the following problems. Also write at least 5 examples of your own.
 Q 1: The surface area of a sphere is 221.76 Sq. cm. Find its radius.4.26.2 cm.6 cm.4 cm. Q 2: The surface area of a sphere is 4829.44 Sq. cm. Find its radius.19 cm.17 cm.19.6 cm.17.6 cm. Q 3: The surface area of a sphere is 346.5 Sq. cm. Find its radius.5 cm.5.5 cm.5.27 cm.5.25 cm. Q 4: The surface area of a sphere is 616 Sq. cm. Find its radius.9 cm.6 cm.7 cm.8 cm. Q 5: The surface area of a sphere is 7983.36 Sq. cm. Find its radius.23.5 cm.23 cm.25.2 cm.25 cm. Q 6: The surface area of a sphere is 3850 Sq. cm. Find its radius.17.6 cm.17 cm.17.8 cm.17.5 cm. Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!