Question

The hemisphere ball made of brash as inner diameter as 10.5cm. find cost of tin plating from inside an rate of rupees 4per 100cm^2​

Answer 1

Answer:

Here, we will tin-plate inside of the hemisphere

So, we need to find the Curved Surface Area of hemisphere

Radius of sphere = r = diameter / 2 = 10.5  / 2 = 5.25 cm

Curved Surface Area of hemisphere = 2πr²

Curved Surface Area of hemisphere = { 2 x 22/7 x 5.25 x 5.25 } cm²

Curved Surface Area of hemisphere = 173.25 cm²

Cost of tin-plating 100 cm² = ₹16

Cost of tin-plating 1 cm² = ₹1/100 x 4

Cost of tin-plating 173.25 cm² = ₹1/100 x 4 x 173.25

Cost of tin-plating 173.25 cm² = ₹6.93