Question

the circumference of a base of a cylinder is 180cm and it's height is 30cm. find the curved surface area.​

Answer 1

Answer:

Step-by-step explanation:

we know that circumference=2×pie× radius

then 180=2×22÷7×radius

then 180×7÷2×22=90×7÷22

=630÷22 which is the radius then curved surface area 2pierh

so 2×22÷7×630÷22×30

we will get the answer 5400 cm 2

Answer 2

Answer:

1099cm (Brainliest Please^^)

Step-by-step explanation:

The circumference of base of cylinder is 2πr = 10π cm

r=5cm

Area of base πr  ^2 =  22/7  ×5×5=78.5

The height is 30cm

The curved surface area is 10π×30

* 300×  22/7

​ =942cm  

Surface area is 942+2(78.5)=157+942=1099cm