Question

10. Find the area of the space enclosed by two concentric circles of radii 25 cm and 17 cm.
11. A path of width 3.5 m runs all around a circular pool having an area of 962.5 m2. Find the area
of the path.
12. A circular field of radius 41 m has a circular path of uniform width 5 m along and inside its
boundary. Find the co of iving the path at 25 per sq. metre.​

Answer 1

Answer:

10. pi (25÷25 - 17÷17 = 336pi cm sq.

11. 422.24 m^2

12. Radius of circle = 41m

inner radius = 41 - 5 = 36m

area of path = radius sombly (41^2 - 36^2) =

1209.5m^2

cost = 1209.5 × 25 = 30237.8

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