Question

Find the radius of a circle and its area if its circumference is 2640cm.​

Answer 1

Answer:

Given:Circumference of the base=2πr=66 cm

⇒2×  

7

22

​  

×r=66

⇒r=  

2×22

66×7

​  

=  

2

21

​  

=10.5 cm

Curved Surface area of a cylinder=2πrh=2640 sq.cm

⇒h=  

2π×10.5

2640

​  

=  

2×22×10.5

2640×7

​  

=10 cm

Volume of cylinder =πr  

2

h=  

7

22  

×10.5×10.5×10=3,465cm^3