Question

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

Answer 1

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

Answer 2

Given that:
Diameter = 5 cm
which means,
Radius= $\frac{diameter}{2}$ = $\frac{5}{2}$ = 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