Question

1. CSA of a
a cylinder is
880 sq.cm.if radius is 10 cm.find it's volume.

2.Height and slant height of
a cone are 15m and 17m respectively. Find
it
radius.


3. CSA of
Find
hemisphere is 1232sq.cm. find
its diameter.


4.find the
volume of
the sphere whose
radius
is
4.2 m.
​

Answer 1

Step-by-step explanation:

Let r and h be the radius and height of the solid right circular cylinder respectively.

Let S be the total surface area of the solid right circular cylinder.

Given that r=10cm and S=880cm

2

Now, S=880 ⇒2πr[h+r]

2×

7

22

×7×10(h+10)=880

⇒h+10=

2×22×10

880×7

⇒ h+10=14

Thus, the height of the cylinder, h=4cm

Now, the curved surface area, CSA is

2πrh=2×

7

22

×10×4=

7

1760

Thus, the curved surface area of the cylinder =251

7

3

sq.cm.