Question

The circumference of a circle can be found using the formula C = 2r.

Which is an equivalent equation solved for r?

r = C
r = C(2)
r = r equals StartFraction C Over 2 pi EndFraction.
r = r equals StartFraction 2 pi Over C EndFraction.

Answer 1

Answer:

The formula for the circumference of a circle is C = 2r, where r is the radius and C is the circumference. The equation solved for r is r = r equals StartFraction C Over 2 pi EndFraction..

Find the radius of a circle that has a circumference of 16.

r = 4

r = 8

r = 12

r = 16

2

Answer 2

Answer: r equals Start Fraction C Over 2 pi End Fraction.

Step-by-step explanation:

• we know that the circumference of a circle is equal to where, r is the radius of the circle

• Solve for r

That means -----> isolate the variable r

Divide by 2π both sides

Simplify right side

Rewrite

so

r equals Start Fraction C Over 2 pi End Fraction

$C=2\pi r$

$\frac{C}{2\pi }$ $= \frac{2\pi r}{2\pi }$

$\frac{C}{2\pi }$$=r$

∴ $r=\frac{C}{2\pi }$