Areas related to Circles ncert solutions Chapter 12 Exercise 12.2 Question 9
9. A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire is also used in making 5 diameters which divide the circle into 10 equal sectors as shown in the figure. Find
(i) the total length of the silver wire required
(ii) the area of each sector of the brooch
Diameter of brooch=35 mm
Therefore, radius=
mm
(i)
The total length of silver wire = Circumference of brooch + length of 5 diameters
mm
(ii)
Area of every sector is equal.
Therefore, area of one sector = area of circle/10
Area of one sector =
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