Question

pls answer asap

volume of cube

surface area of cube

volume of cuboid

surface area of cuboid

csa of hemisphere

tsa of hemisphere

volume of hemisphere

volume of sphere

surface area of sphere

volume of cylinder

csa of cylinder

tsa of cylinder

volume of cone

csa of cone

tsa of cone

formula
of l(slant height of cone)

Answer 1

EXEMPLAR PROBLEMS
(c) Total surface area of cone = πr (l + r)
(d) Slant height of cone (l) = 2 2 h r +
• Sphere whose radius = r
(a) Volume of sphere =
4 3
3
πr
(b) Surface area of sphere = 4πr2
• Hemisphere whose radius = r
(a) Volume of hemisphere =
2 3
3
πr
(b) Curved surface area of hemisphere = 2πr2
(c) Total surface area of hemisphere = 3πr2
(B) Multiple Choice Questions
Write the correct answer
Sample Question 1 : In a cylinder, if radius is halved and height is doubled, the
volume will be
(A) same (B) doubled (C) halved (D) four times
Solution: Answer (C)
EXERCISE 13.1
Write the correct answer in each of the following :
1. The radius of a sphere is 2r, then its volume will be
(A)
4 3
3
πr (B) 4πr3 (C)
3 8
3
πr
(D)
32 3
3
πr
2. The total surface area of a cube is 96 cm2
. The volume of the cube is:
(A) 8 cm3 (B) 512 cm3 (C) 64 cm3 (D) 27 cm3
3. A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast
into a sphere. The radius of the sphere is :
(A) 4.2 cm (B) 2.1 cm (C) 2.4 cm (D) 1.6 cm
4. In a cylinder, radius is doubled and height is halved, curved surface area will be
16/04/18 16/04/18

Answer 2

volume of a cube is = length^3
surface area of cube is 6* length
volume of a cuboid= l *b* h
surface area of cuboid = 2(lb+ lh+hb)
CSA of hemisphere= 2π r^2
TSA of hemisphere =3πr^2
volume of hemisphere = 2/3πr^3
volume of sphere= 4/3πr^3
S A of sphere= 4πr^2
Volume of Cylinder= πr^2h
CSA of cylinder= 2πrh
TSA of cylinder= 2πr(r+h)
volume of cone= 1/3 π r^2 h
CSA of cone =πrl
TSA of cone= πr(r+h)
slant height of cone= √(h^2+ r^2)