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23 July, 19:59

Deena has a set of 4coasters on her coffee tables and each coaster is shaped like a a cylinder with a height of 0.5 inches and a radius of 2.5 inches. Wich is the total surface area of the 4 coasters?

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  1. 23 July, 20:23
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    Suraface Area of cylinder: A=2πrh+2πr^2

    A = 2π (2.5) (0.5) + 2π (2.5) ^2

    Surface Area for each cylinder coaster is ≈47.12.

    I'm not sure if they question is asking to combine all 4 cylinders' surface areas but if so, 47.12*4 = 188.48
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