The diameter of a circle is the width from side to side going through the center on the circle. In other words, the diameter is twice the radius.

To solve, simply use the formula for the diameter of a circle and substitute in the known radius in question.

Thus,

\(\displaystyle r=5\)

\(\displaystyle d=2r=2*5=10\)

The diameter of a circle is the width from side to side going through the center on the circle. In other words, the diameter is twice the radius.

To solve, simply use the formula for the diameter of a circle and substitute in the known radius in question.

Thus,

\(\displaystyle d=2r=2*7=14\)

Since we already know the area of the circle, we can look at the equation for circular area to find the diameter:

\(\displaystyle Area=\pi\cdot r^2\)

\(\displaystyle \\300\;ft^2=\pi\cdot r^2\\r^2=\frac{300\;ft^2}{\pi}=\frac{300\;ft^2}{3.14159}=95.49\;ft^2\\r=\sqrt{95.49\;ft^2}=9.77\;ft\)

\(\displaystyle diameter=2\cdot radius=2\cdot9.77\;ft=19.54\;ft\approx19.5\;ft\)

To solve, simply use the formula for the diameter. Thus,

\(\displaystyle d=2r=2*100=200\)

Don't be fooled by large numbers, simply use the formula how you memorized it. Remember, diameter is just twice the radius.

The formula for the circumference of a circle is:

\(\displaystyle C=\pi d\)

Since the circumference is \(\displaystyle 3\pi\):

\(\displaystyle 3\pi=\pi d\)

We then solve for \(\displaystyle d\):

\(\displaystyle \frac{3\pi}{\pi}=\frac{\pi d}{\pi}\)

\(\displaystyle d=3\)

Therefore, the circle's diameter is \(\displaystyle 3 cm\).

The formula for the area of a circle is:

\(\displaystyle A=\pi r^2\)

Since we know the area is \(\displaystyle 3\pi\), we plug that in to solve for the radius:

\(\displaystyle 3\pi=\pi r^2\)

\(\displaystyle \frac{3\pi}{\pi}=\frac{\pi r^2}{\pi}\)

\(\displaystyle 3=r^2\)

\(\displaystyle r=\sqrt{3}\)

Now that we know the radius, we simply double it to find the diameter:

\(\displaystyle d=2\sqrt{3}\)

So the diameter of the circle is \(\displaystyle 2\sqrt{3}cm\).

To find the diameter of a circle, it is from one side of the circle through the center of the circle to the other side. Or if the radius is from the center of a circle to the edge, the diameter must be twice the radius.

\(\displaystyle d=2r\)

Since the information given is the radius of the circle we know that \(\displaystyle r=25\).

Substituting the radius into the above equation we can solve for the diameter.

\(\displaystyle \\d=2(25) \\d=50\)

Therfore the diameter of this circle is double 25 yards which would be 50 yards.

To find the diameter of a circle, it is from one side of the circle through the center of the circle to the other side. Or if the radius is from the center of a circle to the edge, the diameter must be twice the radius.

\(\displaystyle d=2r\)

Since the information given is the radius of the circle we know that \(\displaystyle r=5\).

Substituting the radius into the above equation we can solve for the diameter.

\(\displaystyle \\d=2(5) \\d=10\)

Therfore the diameter of this circle is double 5cms which would be 10cms.

We find the circumference of circles with the relationship \(\displaystyle C=\pi *D\), where D is diameter.

Since we are given the circumference of the pool, solve for D by dividing both sides by \(\displaystyle \pi\).

\(\displaystyle D=\frac{C}{\pi}=\frac{27meters}{\pi} =\mathbf{8.6\hspace{1mm}meters}\)

The radius is half of the diameter.

\(\displaystyle 2r=d\)

\(\displaystyle 2(7cm )=d\)

\(\displaystyle d=14cm\)