Question

Find the surface area of a bar of soap if the diameter is 5 cm and the height is 2cm .

Answer 1

Given that:
Diameter = 5 cm
which means,
Radius=
`(diameter)/(2)` =
`(5)/(2)` = 2.5 cm (radius is half the diameter)
and Height = 2 cm
We can assume that the shape is cylindrical

Formula of the Surface Area of a Cylinder
=2
`\pi`r² + 2
`\pi`rh
=2
`\pi`(2.5)² + 2
`\pi`(2.5)(2)
=12.5
`\pi` + 10
`\pi`
=22.5
`\pi` cm² (in terms of
`\pi`)
=70.69 cm² ≈ 70.7 cm²

Answer 2

Please see the pic, I'd solved in it.