The outer surface of a sphere of radius R is painted with minimum amount of blue paint. How many circles of radius R can be painted with same amount of blue paint?

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A
4

Surface area of a sphere of radius r

= 4 times the area of a circle of radius r = 4 × $π r^{2}$

Therefore, 4 circles can be painted.

Suggest Corrections

Similar questions

A cylindrical roller of radius 8 m and height 20 m is to be painted. The ends are to be painted in red and the curved surface is to be painted in blue. If the cost of painting in red is $₹ 2.1 p e r m^{2}$ and the in blue is $₹ 1.4 p e r m^{2}$ , what is the total cost of painting?

Q. How many cubes will have only a two surfaces painted with red and blue colour respectively?

Q. To make green paint, a painter mixes yellow paint and blue paint in the ratio of

3 : 2

. If he used twelve liters of yellow paint, how much blue paint did he use?

Q. How many cubes will be there with only one face painted blue?

If blue and yellow paints are mixed in the ratio 7:5 to make a new colour, blue paint is used 10 litres more than yellow paint then find how many litres of blue and yellow paint is used.

Join BYJU'S Learning Program

The outer surface of a sphere of radius R is painted with minimum amount of blue paint. How many circles of radius R can be painted with same amount of blue paint?

The correct option is A 4 Surface area of a sphere of radius r = 4 times the area of a circle of radius r = 4 ×πr2 Therefore, 4 circles can be painted.

The correct option is A
4

Surface area of a sphere of radius r

= 4 times the area of a circle of radius r = 4 × $π r^{2}$

Therefore, 4 circles can be painted.