Question

The diameter of a sphere is 28 cm find the cost of painting it all around at rs0.10 per square cm

Answer 1

the diameter of sphere = 28 cm

so

r= 28 /2 = 14cm

so the surface area of sphere = 4(22/7)(14)(14

= 2464 cm^2

since

the cost of painting of per centimeter sq= 0.10rs

so the total cost of painting = 2464(0.10)

= 246.4 rs

Answer 2

Given data:-

The diameter of a sphere is $28\: cm$

cost of Painting per square cm $Rs.0.10$

Find:-

Find the cost of painting the sphere.

Formula for area of a sphere is $4\pi r^{2}$

Radius of a sphere is $\frac{D}{2}$.

Substitute the value of Diameter in the valu equation we get,

$R=\frac{28}{2}=14cm$

The area of a sphere $4\times \pi \times 14^{2}$

$=4\times \pi \times 196\\=2461.76 \:cm^{2}$

The cost of painting all the sphere is ,

$=2461.76\times 0.10\\=246.176.$

$Rs.246.176$

Hence the cost of painting the sphere is $Rs.246.176$

Note:correct question should be:-

The diameter of a sphere is 28 cm find the cost of painting it all around at rs0.10 per square cm