Question

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 Fig. 12.12. Find:

(i) the total length of the silver wire required.

(ii) the area of each sector of the brooch.​

Answer 1

Answer:

Diameter =35mm

∴ Circumference of circle

=2×π×r =2×π×17.5=110mm

i) The total length of the silver wire required

= Circumference of circle + (5×35)

=110+175 = 285mm

(ii) The area of each sector of the brooch

= Area of circle

10

= π×17.5×17.5

10

= 385. mm²

4

Step-by-step explanation:

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