Question

the exercises were being done by them meaning in tamil​

Answer 1

$\huge\mathfrak{AnSwer}$

⇝The exercises were being done by them

→அவர்கள் பயிற்சி

Answer 2

Answer:

Given :-

The radius of circular cylinder is 10.5 cm and its height is 24 cm.

To Find :-

What is the CSA and TSA of the circular cylinder.

Formula Used :-

❶ To find CSA of cylinder we know that,

$\boxed{\bold{\small{Curved\: Surface\: Area\: of\: Cylinder\: =\: 2{\pi}rh}}}$

❷ To find TSA of cylinder we know that,

$\boxed{\bold{\small{Total\: Surface\: Area\: of\: Cylinder=\: 2{\pi}r(r + h)}}}$

where,

r = Radius

h = Height

Solution :-

❶ To find CSA of cylinder,

Given :

Radius = 10.5 cm

Height = 24 cm

According to the question by using the formula we get,

⇒ CSA = $2 \times \dfrac{22}{7} \times 10.5 \times 24$

⇒ CSA = $2 \times \dfrac{22}{7} \times 252$

⇒ CSA = $2 \times 792$

➠ CSA = 1584 cm²

$\therefore$ The curved surface area of a cylinder is 1584 cm² .

❷ To find TSA of cylinder,

Given :

Radius = 10.5 cm

Height = 24 cm

According to the question by using the formula we get,

↦ TSA = $2 \times \dfrac{22}{7} \times 10.5(10.5 + 24)$

↦ TSA = $2 \times \dfrac{22}{7} \times 10.5(34.5)$

↦ TSA = $2 \times \dfrac{22}{7} \times 362.25$

↦ TSA = $2 \times 1138.5$

➥ TSA = 2277 cm²

$\therefore$ The total surface area of cylinder is 2277 cm² .