Question

find the missing measurements for each circle. you can use 3.14 as an approximation for pi. the radius of the circle is 7.8 cm, and point c is the center. find the length of the diameter and the approximate circumference of the circle. radius (cm) diameter (cm) circumference (cm) 7.8

Explanation:

Step1: Find the diameter

The diameter $d$ of a circle is twice the radius $r$. So $d = 2r$. Given $r=7.8$ cm, then $d = 2\times7.8=15.6$ cm.

Step2: Find the circumference

The formula for the circumference $C$ of a circle is $C = 2\pi r$ or $C=\pi d$. Using $\pi\approx3.14$ and $d = 15.6$ cm, we have $C\approx3.14\times15.6 = 48.984$ cm.

Answer:

Diameter: 15.6 cm
Circumference: 48.984 cm