Question

outside the boundary of a circular ground of radius 15 metre there is a circular path of uniform width of 5 metre find the area of a path ​

Answer 1

Answer:

Step-by-step explanation:

radius of circle= 41m

inner radius = 41-5 = 36m

area of path =π(41^2 - 36^2) = 1209.5 m^2

cost = 1209.5 × 25 = 30237.8

Answer 2

Step-by-step explanation:

Radius of full fig. = 20 m

Area '' " " = (22×20×20)÷7

= (8800÷7)m²

Area of ground = (22×15×15)÷7

= {(225×22)÷7}m²

Area of path = (880÷7)-{(225×22)÷7}

= (8800-4950)÷7

= 3850÷7

= 578.57m² (approx.)