The diameter of a water glass is 8.2cm. find the circumference. use 3.14 for pi.

Question

asked Feb 2, 2023 62.4k views

1 Answer

GwydionFR · Answer 1 · 2023-02-06T13:40:24+0000

hello

to solve this problem, we simply need to use the formula of circumference of a circle

$C=2\pi r$

now, let's write down our data in the question

$\begin{gathered} c=\text{ ?} \\ d=8.2\operatorname{cm} \\ \pi=3.14 \end{gathered}$

in this question, we are given the value of diameter and not radius, so we have to find the radius from the diameter.

the relationship between diameter and radius is

now, let's find the radius of the circle

$\begin{gathered} r=(8.2)/(2) \\ r=4.1\operatorname{cm} \end{gathered}$

now, we an proceed to solve for the circumference

$\begin{gathered} c=2\pi r \\ c=2*3.14*4.1 \\ c=25.748\approx25.75\operatorname{cm} \end{gathered}$

from the calculations above, the circumference of the circle is 25.75cm