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The shape of top of a table in a restaurant is that of a sector of a circle with the centre O and ∠BOD = 90°, BO = OD. Find the perimeter of table.

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402.6

256

580

780

answer is A.

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Detailed Solution

We have angle made by sector at centre = 360° − 90° = 270°
r = 60cm
⇒ Perimeter of table

= 120 + 282.6
= 402.6cm

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