Silo

Outer perimeter of silo is 32 m. Concrete wall is 35 cm thick. What is diameter and area of inside floor of silo?

Correct answer:

d =  9.49 m
S =  70.67 m²

Step-by-step explanation:

$$\begin{gathered} 32=2\pi r=\pi D \\ d=D-2h={\displaystyle \frac{32}{\pi }}-{\displaystyle \frac{2\cdot 35}{100}}=9.49\text{ m} \end{gathered}$$

$S=\pi r^2=\pi {\displaystyle \frac{d^2}{4}}=70.67{\text{m}}^2$

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