Question

find the missing measurements for each circle. you can use 3.14 as an approximation for pi. the circumference of the circle is 66 cm, and point d is the center. find the approximate length of the radius and the diameter of the circle. radius (cm) diameter (cm) circumference (cm) 66

Explanation:

Step1: Recall the formula for circumference

$C = 2\pi r=\pi d$, where $C$ is circumference, $r$ is radius and $d$ is diameter. Given $C = 66$ cm and $\pi\approx3.14$.

Step2: Calculate the radius

Since $C = 2\pi r$, then $r=\frac{C}{2\pi}$. Substitute $C = 66$ cm and $\pi = 3.14$ into the formula: $r=\frac{66}{2\times3.14}=\frac{66}{6.28}\approx10.51$ cm.

Step3: Calculate the diameter

Since $d = 2r$, then $d=2\times10.51 = 21.02$ cm.

Answer:

Radius (cm): 10.51
Diameter (cm): 21.02