Question

find the area of the lateral surface and the total surface of the cylindrical whose radius of the base is 7cm and hight is 25 cm​

Answer 1

Answer:

LSA, 1100 cm/square

TSA, 1408cm/square

Step-by-step explanation:

LSA of the cylinder 2πrh

=2×22/7×7×25 = 1100

TSA of the cylinder

2πr(h+r)

2×22/7×7 (25+7) = 1408

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Answer 2

Given:

A cylinder whose :

radius, r = 7cm

height, h = 25cm

To find:

(i) Lateral Surface Area

(ii) Total Surface Area

Solution:

(i) Lateral Surface area

Formula for Lateral Surface area of Cylinder = 2πrh

Putting the values,

$\therefore \rm \: 2 \times \frac{22}{7} \times 7 \times 25 \\ \rm \implies 2 \times 22 \times 25 \\ \rm \implies \bf \red{1100cm^{2}}$

Lateral surface area = $\rm \bf 1100cm^2$

(ii) Total Surface Area

Formula for Total surface area of Cylinder = 2πr(h+r)

Putting the values,

$\therefore \: \rm 2 \times \frac{22}{7} \times 7(25 + 7) \\ \rm \implies \: 2 \times 22 \times 32 \\ \implies \rm \: \bf \red{1408cm^{2} }$

Total surface area = $\rm \bf 1408cm^2$