11. Exercise problems IX

A brooch is made with silver wire in the form of a circle with a diameter of $35 mm$. The wire is also used in making $5$ diameters which divide the circle into $10$ equal sectors as shown in Fig. Find:

 

 

 

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

 

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

 

Ans: