Question

Radius circular park is 10.5m. If it has
3.5.cm wide path running , around it on out
side. Find cost of gravelling path at rate rupees 10/m²​

Answer 1

sry

$78$

add mee formula

Answer 2

Answer:

let radius of the big circles, r1 = 10.5m

" " " " small circle, r2 = 10.5 - 3.5

= 7

now area of the big circle = pie r1^2

22/7 × 10.5 × 10.5

22 × 1.5 × 10.5

= 346.5

area of the small circle = 22/7 × 7 × 7

= 22× 7

= 154

now area of the path

area of big circle - area of small circle

346.5 - 154

= 192.5 m^2

cost of gravelling 1m^2 = Rs 10

" " " 192.5m^2 = 192.5 × 10

= Rs 1925