Answer: d=21.98
Let’s start by rewriting the equation for the diameter
2 × radius
We know that this is going to equal the circumference. Let’s add that into the equation.
2 × radius = circumference
To make this easier to solve, let’s shorten those words into only their first letter. By using this variable it will become less confusing for one to solve.
2 × r = c
Finally before we start solving let’s shorten
2 × r to 2r and let’s change c to the value of the circumference.
2r= 21.98
Now we can start solving
To get our answer, we need to first get r alone. We can do this by undoing the multiplication with division. Let’s divide 2r and 21.98 by 2.
2r/2= 21.98/2
r=10.99
Now that we have the radius, we need to solve for diameter. Let’s write out the equation for diameter.
d=2r
Now that we know what r is, let’s substitute that in
d=2(10.99)
d=21.98
This is your answer! Hope this helps comment below for more questions :)