Question

Find the surface area of a cylinder with a base radius of 2 cm and a height of 8 cm

Answer 1

82.6cm2

Explanation:

`\pi {r}^(2) + \pi {r}^(2) + 2 \pi \: r h`

`\pi = (22)/(7)`

radius =2cm

height=8cm

`( (22)/(7) * 2 * 2 )+ ( (22)/(7) * 2 * 2) + (2 * (22)/(7) * 2 * 8)`

Multiplying the numerators and The whole numbers, we have

`(88)/(7) + (88)/(7) + (402)/(7)`

Since the denominators of the fractions are the same, we add the numerators.

`(88 + 88 + 402)/(7) = (578)/(7) \\ which \: becomes \\`

`82.57{cm}^(2) = 82.6 {cm}^(2)`