Question

Q4. The seven small domes are to be painted outside with white paint. Theradius of the dome is 1m . Calculate the total cost if the cost per metresquare is Rs 21.​

Answer 1

Answer:

Rs. 462

Step-by-step explanation:

Formula for circle area - (pi)r²

pi = 3.14

r = 1 m

(pi)r² = (3.14)1²

= (3.14) 1 x 1

= 3.14 x 1

= 3.14 m²

Area of 7 dome = 3.14 x 7 = 21.98m² (round to 22)

Cost of m² = Rs. 21

Area of 7 domes = 22m²

Cost for painting 7 domes = 22 x 21 = Rs.462 or Rs. 461.58 (without rounding)

Area of 1 dome = 3.14m²

Cost of painting 1 dome = 3.14 x 21 = Rs. 65.92 or Rs. 66 (rounded)