Question

the diameter of a closed cylinder is 21cm and hight is 10cm.find the total surface area of the cylender​

Answer 1

Answer:

radius = 21/2 = 10.5

according to question :-

area = 2πrh + 2πr^2

so

area = 2*22/7*10.5*10 + 2*22/7*10.5*10.5

Area = 44/7*105 + 44/7*110.25

area = 4620/7 + 4851/7

area = 660 + 693

area = 1353 cm^2

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Answer 2

Answer:

320 is the answer.

Step-by-step explanation:

given data :

d =21

h =10

solution :

2×22/7 ×r×h

2×22/7×21/2 ×10

2×11×10

20×11

=320 .