alleryஆரம் r கொண்ட ஒரு கோளத்தின் மொத்த வெளிப்புறப் பரப்பளவைக் கணக்கிடும் இயற்கணிதக் கோவை எது?
A2pi * r^2
B4pi * r^2
C(4/3)pi * r^3
D(2/3)pi * r^3
Answer & Solution
Correct answer: B. 4pi * r^2
ஆரம் r கொண்ட ஒரு கோளத்தின் புறப்பரப்பளவு 4 * pi * r^2 என்பதால் பெறப்படுகிறது.
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