Find the total surface of the following cylinders :
(1) Radius = 7 and height = 4 cm.
(ii) Radius = 4.2 cm and height = 4.2 cm.
ii) Diameter = 9 cm and height = 1.4 cm
please answer
Answers
Answered by
4
Step-by-step explanation:
1) Radius = 7cm
height = 4 cm
TSA = 2πrh + 2πr²
= 2* 22/7* 7* 4 + 2* 22/7* (7)²
= 176 + 308
= 484cm²
2) Radius = 4.2cm
height = 4.2cm
TSA = 2πrh + 2πr²
= 2* 22/7* 4.2 * 4.2 + 2* 22/7* (4.2)²
= 110.88 + 110.88
= 221.76 cm²
3) Diameter = 9cm
height = 1.4cm
We know that radius is diameter/2
So, radius = 9/2
= 4.5cm
TSA = 2πrh + 2πr²
= 2* 22/7* 4.5* 1.4 + 2* 22/7* (4.5)²
= 39.6 + 127.285714
= 166.885714cm²
Similar questions