Question

the curved surface area of a cylinder wirh radius 3.5cm and height 2cm is​

Answer 1

Answer:

GIVEN:-

radius - 3.5cm

height - 2cm

FORMULA USED :-

curved surface area -

$2\pi {r}h$

SOLVING:-

CURVED SURFACE AREA OF THE CYLINDER =

$= 2\pi {r}h$

$= 2 \times \frac{22}{7} \times 3.5 \times 2$

$= 2 \times \frac{22}{7} \times \frac{35}{10} \times 20$

$= 2 \times 22 \times 2 \times 2$

$= 44 \times 2 \times 2$

$= 44 \times 4$

$= 176 {cm}^{2}$

therefore, curved surface area of the cylinder is 176cm²

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Answer 2

• Curved surface area of cylinder is 44 cm².

Step-by-step explanation:

Given:-

• Radius of cylinder is 3.5 cm.
• Height of cylinder is 2 cm.

To find:-

• Curved surface area.

Solution:-

We know,

Curved surface area of cylinder = 2πrh

Where,

• r is radius and h is height of cylinder.
• Value of π is 3.14 or 22/7.

Put r and h in formula

$\longrightarrow$ 2 × π × 3.5 × 2

$\longrightarrow$ 2 × 22/7 × 3.5 × 2

$\longrightarrow$ 44/7 × 3.5 × 2

$\longrightarrow$ 44/7 × 7

$\longrightarrow$ 308/7

$\longrightarrow$ 44

Therefore,

Curved surface area of cylinder is 44 cm².

______________:

Two more formulas of cylinder

• Total surface area of cylinder is 2πr(r + h). Where r is radius and h is height of cylinder.

• Volume of cylinder is πr²h. Similarly as above formula h and r and height and radius of cylinder.