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### High School Mathematics4.20 Word Problems on Sphere - II

 Example: The radius of a sphere is 14 cm. to paint the surface of the sphere at 2 cents per 1 Sq. cm. how much will it cost? Solution: Given that, Radius of the sphere = 14 cm. Surface area of the sphere = 4 * pi * r2 = 4 * 22/7 * 14 * 14 = 88 * 2 * 14 = 2464 Sq. cm. Cost to paint to surface = 2 cents per 1 Sq. cm. Total cost of painting the the surface = 2464 * 2 = 4928 cents = \$49.28 Directions: Solve the following problems. Also write at least 5 examples of your own.
 Q 1: The radius of a sphere is 19.6 cm. to paint the surface of the sphere at 2 cents per 1 Sq. cm. how much will it cost?\$ 96.8885\$ 96.8588\$ 96.5888\$ 96.8858 Q 2: The radius of a sphere is 3.5 cm. to paint the surface of the sphere at 5 cents per 1 Sq. cm. how much will it cost?\$ 7.70\$ 7.75\$ 7.50\$ 7.25 Q 3: The radius of a sphere is 4.2 cm. to paint the surface of the sphere at 6 cents per 1 Sq. cm. how much will it cost?\$ 13.0635\$ 13.0563\$ 13.3065\$ 13.3056 Q 4: The radius of a sphere is 17.5 cm. to paint the surface of the sphere at 4 cents per 1 Sq. cm. how much will it cost?\$ 158\$ 156\$ 152\$ 154 Q 5: The radius of a sphere is 10.5 cm. to paint the surface of the sphere at 3 cents per 1 Sq. cm. how much will it cost?\$ 41.78\$ 41.85\$ 41.58\$ 41.87 Q 6: The radius of a sphere is 44.1 cm. to paint the surface of the sphere at 2 cents per 1 Sq. cm. how much will it cost?\$ 488.8908\$ 488.0988\$ 488.9808\$ 488.9088 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!