Question

plzz solve it fast. ​

Answer 1

Answer:

Step-by-step explanation:

Radius = 20 x 10⁻² m

area of one plate = π r²

                             = 3.14 x 20 x 20 x 10⁻⁴

                             = 0.1256 m²

area of 12 plates = 0.1256 x 12 = 1.5072m²

cost of polishing = 450 x 1.5072 = 678.24 Rupees

Answer 2

this is answer of your question