Question
Puja decides to cut a circular disc into 4 equal parts. What is the perimeter of each part? (Given that the radius of the disc = 7cm, π = 227)
Answer: Option B
:
B
When a circular discis cut into four equal parts, the perimeter of each part is more than 2πr4. This is because the length of two radii are also added to the perimeter in each part.
Perimeter of each part = 2πr4+ r + r
=πr2 + 2r
=22×77×2+ 2r
= 11+2×7
= 11 + 14
= 25 cm
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:
B
When a circular discis cut into four equal parts, the perimeter of each part is more than 2πr4. This is because the length of two radii are also added to the perimeter in each part.
Perimeter of each part = 2πr4+ r + r
=πr2 + 2r
=22×77×2+ 2r
= 11+2×7
= 11 + 14
= 25 cm
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