SAT Question 186fdbca: Circles answer and explanation with Desmos solution

3$.Thediameterofacircleisequalto＄2r$, where $r$ represents the radius of the circle. It’s given that a circle has a diameter of ＄12.6$centimeters.Therefore,＄12.6=2r$. Dividing both sides of this equation by ＄2$yields$6.3 = r$.Itfollowsthattheradiusofthecircle,incentimeters,is＄6.3$. Note that 6.3 and 63/10 are examples of ways to enter a correct answer.