Question

6
Find total surface area of the
cylinder. If radius is 2.1cm and it's
height is 2.8cm. n=22/7 *
(2 Points)
64.68
36.96​

Answer 1

Answer:

64.68 cm²

Step-by-step explanation:

Given -

Radius of cylinder = 2.1 cm

Height of cylinder = 2.8 cm

To find -

Total Surface Area of cylinder (T. S. A.)

Solution -

TSA of cylinder = 2πrh+2πr² or 2πr(h+r)

= 2×22/7×2.1 (2.8+2.1)

= 2×22×2.1/7 (4.9)

= 44×0.3×4.9

= 64.68 cm²

Hence total surface area of cylinder = 64.68 cm².

hope it helps.

Answer 2

Given:

• The radius (r) of the cylinder is 2.1 cm
• The height (h) of the cylinder is 2.8 cm

To find:

The Total Surface Area of the cylinder

The formula to find the Total Surface Area of the cylinder is

• 2πr(h+r) cm sq.

$\bf TSA\ of\ cylinder = 2 \times \frac{22}{7} \times 2.1 (\underline{2.1 + 2.8})$

$\bf TSA\ of\ cylinder = 2 \times \frac{22}{\underline{7}} \times \underline{2.1} (4.9)$

$\bf TSA\ of\ cylinder = 2 \times 22 \times 0.3 (4.9)$

TSA of cylinder = 64.86 cm sq.

Hence

The Total Surface Area of the cylinder is 64.68 cm sq

(Option 1 is correct i.e. 64.68)

More information:

Total Surface Area of the cylinder = Curved Surface Area of the cylinder + 2*Area of the base

Or,

TSA = CSA + 2*Area of base

TSA = 2πrh + 2πr²

Now taking (2πr) common, we get,

TSA = 2πr(h+r)