Question

Pls help I keep getting it wrong

Answer 1

Explanation:

You will need to add the sidewall area and the two end areas

Sidewall area = pi * d * h

End area = pi * r2 ======that is r squared .....note you will need two of these and that it is the radius NOT the diameter !

Add these together to find to total area in cm squared

Take it away !

Answer 2

• 175.8 cm³

Explanation:

We are given with :-

• A cylinder has a diameter of 8 cm and height of 3 cm.

To Find :-

• Surface Area

Answer :-

Surface area of cylinder is calculated by the formula :

• Surface area = 2πr( r + h)
• Where 'r' is the radius and 'h' is height.

Since diameter is 8 cm, radius will be half of the diameter and half of 8 is 4. So the radius of the cylinder is 4 cm.

On plugging the required value in the above formula, we get;

`\longrightarrow 2 * 3.14 * 4 (4 + 3)`

`\longrightarrow 6.28 * 4 (7)`

`\longrightarrow 25.12 (7)`

`\longrightarrow 175.84`

`\longrightarrow 175.8 cm^2`

Henceforth, The surface area of the cylinder is 175.8 cm³