(iii) (a) Find the area of each sector of the brooch.

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Step 1: Area of each sector $= \frac{1}{10} 	imes \pi r^2 = \frac{1}{10} 	imes \frac{22}{7} 	imes \left(\frac{35}{2}ight)^2 = \frac{1}{10} 	imes \frac{22}{7} 	imes \frac{1225}{4}$
Step 2: $= \frac{385}{4}$ mm$^2$ or $96.25$ mm$^2$

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