Question

the formula ( r=\frac{d}{2} ) can be used to find the radius of a circle, ( r ), given the diameter, ( d ). given ( r ), which equation finds ( d )?
a. ( d=\frac{r}{2} )
b. ( d=r + 2 )
c. ( d=r - 2 )
d. ( d = 2r )

Explanation:

Step1: Solve the equation for \(d\)

Given \(r=\frac{d}{2}\), multiply both sides by \(2\).
\(2r = d\)

Answer:

D. \(d = 2r\)