1. A cone of height 8 m has a curved surface area 188.4 square metres. Find its volume.
2. Find the volume and curved surface area of a right circular cylinder of height 21 cm and
base radius 5 cm.
3. The surface area of a sphere is 394.24 m2
. Find its radius and volume.
7. The mean of the following data is 21.6. Find p.
Xi: 6 12 18 24 30 36
Fi : 5 4 p 6 4 6
Answers
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given
height 8 m
curved surface area 188.4 square metres
L =
= π r ()
118.4 =3.14* r ()
=r* ()
60 = r * (64 + )
Squaring both the sides,
3600 =
3600 = 64
Now lets take = 0
(x+100)(x-36) = 0
x = -100,36
= 36 (only positive value)
Volume = 1/3 π h
=1/3 * 3.14 * 6 * 6 * 8
=301.44
height 8 m
curved surface area 188.4 square metres
L =
= π r ()
118.4 =3.14* r ()
=r* ()
60 = r * (64 + )
Squaring both the sides,
3600 =
3600 = 64
Now lets take = 0
(x+100)(x-36) = 0
x = -100,36
= 36 (only positive value)
Volume = 1/3 π h
=1/3 * 3.14 * 6 * 6 * 8
=301.44
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