| Directions: Q. 16 to 20 |
| A brooch is a small piece of jewellery which has a pin at the back so it can be fastened on a dress, blouse or coat. |
| Designs of some brooch are shown below. Observe them carefully. |
 |
| Design A Brooch A is made with silver wire in the form of a circle with diameter 28 mm. The wire used for making 4 diameters which divide the circle into 8 equal parts. |
| Design B Brooch b is made two colours Gold and silver. Outer part is made with Gold. The circumference of silver part is 44 mm and the gold part is 3mm wide everywhere. |
| Refer to Design A |
| (i) The total length of silver wire required is |
A) 180mm
B) 200mm
C) 250mm
D) 280mm
Correct Answer: B
Solution :
Given, diameter of circle, d = 28 mm \[\therefore \]Circumference of circle \[=\pi d\] \[\left[ \because \,\,d=2r \right]\] \[=\frac{22}{7}\times 28=88\,\,mm\] Now, length of 4 diameters \[=4\times 28\text{ }=112\text{ }mm\] Total length of the silver wire \[=\pi d+4d\] \[=88+112=200\text{ }mm\]
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