The diameter of the base of a right circular cylinder is 42cm and its height is 10cm. Find the area of the curved surfaces and total surface area.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Find the radius of the base
The diameter of the base of the cylinder is given as 42 cm. To find the radius, we divide the diameter by 2.

\[ \text{Radius} (r) = \frac{\text{Diameter}}{2} = \frac{42 \text{ cm}}{2} = 21 \text{ cm} \]
...