Question

Find the diameter of a circle
whose circuference is 66 cm.​

Answer 1

Answer:

21. 01 ans

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Answer 2

Answer:

I’m taking a reasonable guess that the first reference to circumference was an error.

Circumference is calculated as pi*diameter so the diameter of this circle is 66/pi

For the area, you need the radius in order to calculate pi * r^2

As the radius is half of the diameter, the radius of the circle is 33/pi

The area may now be calculated as pi*((33^2)/(pi^2)), so the numerator can be multiplied by pi or the denominator can be divided by pi. The latter looks simpler

giving 33^2/pi

This comes to 1089/pi which gives a close decimal approximation of 347 cm^2 (to 3 significant figures).