If a sphere of radius r is divided into 4 identical parts, then the total surface area of the four parts is -- a 4 pi r^2 square unit b 2 pi r^2 square unit c 8 pi r^2 square unit d 3 pi r^2 square unit
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The total surface area of a sphere is 4πr².
If we cut it one time from the middle then increase in the surface area is of 2πr².
If we rotate it 90° (doesn't matter whether clockwise or anti-clockwise), and cut it again from the middle then the increase would again be of 2πr².
Thus, the total surface area will be = 4πr² + 2πr² + 2πr² = 8πr²
Therefore, option [c] is correct.
If we cut it one time from the middle then increase in the surface area is of 2πr².
If we rotate it 90° (doesn't matter whether clockwise or anti-clockwise), and cut it again from the middle then the increase would again be of 2πr².
Thus, the total surface area will be = 4πr² + 2πr² + 2πr² = 8πr²
Therefore, option [c] is correct.
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Answer:
(c)8πr² square units
Step-by-step explanation:
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