What is formulae for circumference when given radius or diameter

2 answers:

6 0

The formula for circumference is C=2 $\pi$ r, where r is the radius. If given the diameter, divide by 2 to get the radius.

Romashka-Z-Leto [24]3 years ago

4 0

The formula of the circumference is πd(pi multiply by the diameter) or 2πr(pi multiply by 2 times the radius[which is the same as the diameter])

The formula for the area of a circle is
$\pi r ^{2}$

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Triangle DEF is congruent to right triangle GHI with a right angle at vertex H. If the slope of DE is –2, what must be true?

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Which means,