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Geometry
6.29 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 616 Sq. cm. Find its radius.
9 cm.
7 cm.
8 cm.
6 cm.

Q 2: The surface area of a sphere is 1386 Sq. cm. Find its radius.
10.5 cm.
10.9 cm.
10.7 cm.
10.3 cm.

Q 3: The surface area of a sphere is 3850 Sq. cm. Find its radius.
17.5 cm.
17 cm.
17.6 cm.
17.8 cm.

Q 4: The surface area of a sphere is 346.5 Sq. cm. Find its radius.
5.5 cm.
5.25 cm.
5.27 cm.
5 cm.

Q 5: The surface area of a sphere is 7983.36 Sq. cm. Find its radius.
23 cm.
23.5 cm.
25 cm.
25.2 cm.

Q 6: The surface area of a sphere is 4829.44 Sq. cm. Find its radius.
17 cm.
19 cm.
19.6 cm.
17.6 cm.

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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