Question

Case Study Based
A brooch is a small piece of jewellery which has a pin at the back so
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 sectors.
A
B
Design B: Brooch B is made in two colours - Gold and
Silver. Outer part is made with gold. The circumference of
silver part is 44 mm and the gold part is 3 mm wide
everywhere.
The total length of the silver wire required is
i) 180 mm ii) 200 mm
iii) 250 mm iv) 280 mm
The area of each sector of the brooch is
i) 44 mm2
ii) 52 mm2
iii) 77 mm2
iv) 68 mm2
The circumference of outer part (golden) is
i) 48.49 mm ii) 82.2 mm iii) 72.50 mm iv) 62.86 mm
The difference of areas of golden and silver parts is
i) 187
ii) 441
iii) 511
iv) 647
A boy is playing with the brooch B. He makes revolution with it along
its edge. How many complete revolutions must it take to cover 80 TT
mm?
i) 2
ii) 3
iii) 4
iv) 5​

Answer 1

Answer:

TOTAL LENGTH- (II)200

AREA OF EACH SECTOR- (III)77

• CIRCUMFERENCE OF OUTER PART GOLDEN- (IV)62.86

DIFF. OF AREAS OF GOLDEN AND SILVER-(III)51 PIE

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Answer 2

Answer:

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