$π$ is the ratio of the circumference to the or the _ of the circle.

Diameter

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Perimeter

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Longest chord of the circle

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Radius

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Solution

The correct options are
A Diameter
C Longest chord of the circle
The Greek letter $π$ (pronounced as Pie) represents the ratio between the circumference and the diameter of a circle.

i.e. $\frac{c i r c u m f e r e n c e o f t h e c i r c l e}{I t s d i a m e t e r (d)} = π$

$\Rightarrow C i r c u m f e r e n c e o f t h e c i r c l e = π \times d$

= 2 $π$ r
Longest chord of every circle is its diameter.

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