Question

Find the total surface area of a right circular cylinder whose radius is equal to 7m and height is equal to 21 m​.​

Answer 1

Answer:

1232 m²

Step-by-step explanation:

Formula

TSA for Cylinder = 2πr(h+r)

Here,

Height of the cylinder = 21 m

Radius of the cylinder = 7 m

putting these values in the equation.

TSA =  2πr(h+r)

= 2 ×$\frac{22}{7}$×7 (21 + 7)

= (2 x 22 x 28) m²

= 1232 m²

Answer 2

Given:

• Radius = 7 m
• height = 21 m

To Find:

• The total surface area = ?

Formula used:

$\\ \bigstar \: { \underline{ \underline{ \underline{ \boxed{ \bold{ \color{red}{Total \: Surface \: Area = 2 \pi r(h + r)}}}}}}}$

where,

• → R ( Radius ) = 7 m
• → H ( Height ) = 21 m

Solution:

★ Putting values from the above formula:

$\\ \sf\dashrightarrow \: Total \: Surface \: Area =2 \: \pi \: r \: (h + r)$

$\sf\dashrightarrow Total \: Surface \: Area = \: 2 \times \frac{22}{7} \times 7 (21 + 7)$

$\sf\dashrightarrow Total \: Surface \: Area = 44 \times 28$

$\sf\dashrightarrow Total \: Surface \: Area = 1232 \: m {}^{2}$

$\bf{\blue{\dashrightarrow TSA= 1232 \: m {}^{2}}} \pink\bigstar$

hence, the total surface area of a right circular cylinder is 1232 m²