Bearon's answer to Justin Goh Wee Chong's Secondary 1 Maths question.
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2pi(r)(h) is the curved surface area of a cylinder but since this is half, take away the 2 to half it...
Date Posted:
7 years ago
a little error i wrote, you can use pi(r)square instead of 1/2 because there is another semicircle at the other side of the solid
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