Question

1. (2 pts) 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 = 2r b. d = r + 2 c. d = r - 2 d. d = \frac{r}{2}

Explanation:

Step1: Recall the relationship between radius and diameter

The formula for the relationship between the radius $r$ and the diameter $d$ of a circle is $d = 2r$. We need to solve this formula for $d$ given $r$.

Step2: Manipulate the formula

Starting from $r=\frac{d}{2}$, we multiply both sides of the equation by 2. So, $2r=d$.

Answer:

A. $d = 2r$