Question

find the missing measurements for each circle. you can use 3.14 as an approximation for pi. circle e has a circumference of 42 cm. what is the approximate length of the radius and the diameter of the circle? radius (cm) diameter (cm) circumference (cm) 42

Explanation:

Step1: Recall circumference formula

$C = 2\pi r=\pi d$, where $C$ is circumference, $r$ is radius and $d$ is diameter.

Step2: Calculate radius

Given $C = 42$ cm and $\pi\approx3.14$. From $C = 2\pi r$, we have $r=\frac{C}{2\pi}=\frac{42}{2\times3.14}\approx6.69$ cm.

Step3: Calculate diameter

Since $d = 2r$ or from $C=\pi d$, we get $d=\frac{C}{\pi}=\frac{42}{3.14}\approx13.38$ cm.

Answer:

Radius (cm): 6.69
Diameter (cm): 13.38