AREAS RELATED TO CIRCLES (i) the area of that part of the field in which the horse can graze. (ii) the increase in the grazing area if the rope were m long instead of m. (Use = . ) .
A brooch is made with silver wire in the form of a circle with diameter mm. The wire is also used in making diameters which divide the circle into equal sectors as shown in Fig. . .
Find : (i) the total length of the silver wire required. (ii) the area of each sector of the brooch. . An umbrella has ribs which are equally spaced (see Fig.
. ). Assuming umbrella to be a flat circle of radius cm, find the area between the two consecutive ribs of the umbrella. .
A car has two wipers which do not overlap. Each wiper has a blade of length cm sweeping through an angle of °. Find the total area cleaned at each sweep of the blades. .
To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle ° to a distance of . km. Find the area of the sea over which the ships are warned. (Use = .
) . A round table cover has six equal designs as shown in Fig. . .
If the radius of the cover is cm, find the cost of making the designs at the rate of ` . per cm2. (Use = . ) .
Tick the correct answer in the following : Area of a sector of angle p (in degrees) of a circle with radius R is (A) R p (B) R p (C) R p (D) R p Fig. . Fig. .