15. If the radius of a sphere is halved then what is the decrease in its surface area?
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5
Answer:
Ho bas yaara bas yaara
Ho bas yaara tere maaran da
Andaaz pasand aaya
Ho bas bas yaara
Ho bas yaara tere maaran da
Andaaz pasand aaya
Answered by
5
Step-by-step explanation:
So easy Question.........
r = r/2
Surface area of sphere = 4πr²
Decrease in surface area = Total surface area - new surface area
= 4πr² - 4π(r/2)²
= 4π(r² - r²/4)
= 4π(4r² - r²/4)
= 4π(3r²/4)
= π(3r²)
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