Question

1)Find the surface area Of a spnere 7cm

2) The total surface area of a sphere is 3850 cm 2. Find the diameter of the sphere.

3)The largest possible sphere is carved out from a solid cube of side 40 m. Find the surface area of the sphere. (Use It = 3.14)

4) The hollow sphere, in which the circus motorcyclist performs his stunts, has a diameter of 7 m. Find the area available to the motorcyclist for riding. [NCERT]

5) The surface area of a sphere is the same as the curved surface area of a cone having the radius of base as 120 cm and height 160 cm. Find the radius of the sphere.

6) The total surface area of a hemisphere is 4158cm2. Find its diameter.

7) The dome of a building is in the form of a hemisphere. Its radius is 63 dm. Find the cost of painting at the rate Of 8 per m 2

8)The external and internal diameters Of a hollow spherical vessel are 12 cm and 10 cm respectively. The cost to paint lcm2 of the surface is ₹2. Find the total cost to paint the vessel all over.

9) A cylinder Of Same height and radius is placed on the top of a hemisphere. Find the curved surface area of the shape so formed if the height of the shape be 7 cm.

10)A toy is in the form of a cone mounted on a hemisphere of radius 3.5 cm. If the total height of the toy is 15.5 cm, find its surface area. (Use n =22/7)

11)A solid is composed of a cylinder with hemispherical ends. If the whole length Of the solid is 104 cm and the radius of each Of the hemispherical ends is 7 cm, find the cost of polishing its surface at the rate el per dm2.

12)A wooden toy is in the form of a cone mounted on a hemisphere. The diameter of the base of the cone is 16 cm and its height is 15 cm. Find the cost of painting the toy at the 0.50 per IOOcm .

13)A solid is in the form of right circular cylinder, with a hemisphere at one end and a cone at the other end. The radius Of the common base is 3.5 cm and the heights of the cylindrical and conical portions are 10 and 6 cm respectively. Find the total surface area of the solid (Use It = 22/7)​

Answer 1

Answer:

don't know thanks for points