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AURORKA [14]
3 years ago
10

The volume of a cylinder closed at the one end is 1056cm cube. If its height is 21cm, and the radius is 4, find the total surfac

e area
​
Mathematics
1 answer:
monitta3 years ago
3 0

Answer:

578 cm^2

Step-by-step explanation:

The surface area is given by one circle of radius 4 (the other is missing!), plus a "rectangle" (the lateral surface) of sides 21 and 2\pi \times 4 (the length of the circumference at the base). Adding them up we get:\pi \times4^2 + 21\times 2\pi\times4 = 184\pi \approx 578 cm^2

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