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notka56 [123]
2 years ago
9

Please answer number 8. I need help, I don’t understand.

Mathematics
1 answer:
Bond [772]2 years ago
6 0

Answer:

A=2πrh+2πr2 this is the surface are formula of a cylinder. You already know the scale ratio is 2.5 so the answer is (2.5*surface area formula). For the formula just plug in the values for the radius and the height that is given and solve.

Step-by-step explanation:

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\bf \textit{sum of all exterior angles in a polygon}\\\\
n\theta =360\quad 
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n=\textit{number of sides}\\
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\end{cases}\implies n21.2=360
\\\\\\
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