Question

find the cost of polishing a circular table top 1.6 m, if the rate of polishing is Rs . 15 / metre square ( take Πto 3.14)​

Answer 1

area of circle = πr² = 3.14×(.8)²= 2.01

cost of polishing = 2.01×15 = 30.15

Answer 2

✠ Correct Question:-

Find the cost of polishing a circular table top of diameter 1.6 m, if the rate of polishing is Rs. 15/m² (Take π = 3.14)

✠ Answer:-

Given:-

• Diameter of the circular table top = 1.6 m
• Rate of polishing the circular table top = Rs. 15/m²

To find:-

• Cost of polishing the circular table top at Rs. 15/m²

Formula to be used:-

• Area of circle = πr², that is,

• Area of the circular table top = πr²

Solution:-

Diameter = 1.6 m

∴ Radius = 0.8 m

Area of the circular table top = πr²

                                                = 3.14 × 0.8 × 0.8

                                                = 2.0096 m²

______________________________________

Cost of polishing 1 m² of the table top = Rs.15

Cost of polishing 2.0096 m² of the table top = 2.0096 × 15

                                                                           = Rs. 30.14 (approx.)

∴ Cost of polishing the area of the circular table top is Rs.30.14