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PLEASE ANYONE HELP ME? :D

PLEASE ANYONE HELP ME? :D-example-1

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Answer:

B, C

Explanation:

The equation for the circumference C of a circle of diameter d is ...

C = πd

That is, π is the constant of proportionality between circumference and diameter.

Clearly, when the diameter is 1, the circumference will be π.

__

π is the circumference when diameter is 1.

π is the constant of proportionality between circumference and diameter.

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