10-1 Circles Circumference Diameter Chord

Find the diameter and radius of a circle if a circle has a circumference of 18 in.

Remember that the circumference formula looks like this C=π•d or C=2•π•r

So if the circumference is 18 in we will plug 18 in for C and then solve for d.

So we will set it up like this 18 = π•d

Divide both sides by π.

You get d = 5.73

That means the diameter of the circle is 5.73.

To get the radius just divide that by 2. 5.73/2

2.87

The diameter is 5.73 inches and the radius is 2.87 inches

Find the diameter and radius of a circle if a circle has a circumference of 124 inches.

Remember that the circumference formula looks like this C=π•d or C=2•π•r

Find the diameter and radius of a circle if a circle has a circumference of 375.3 inches.

Remember that the circumference formula looks like this C=π•d or C=2•π•r

Name a chord from this circle.

Name a diameter from this circle.

Name a radius from this circle.

If CN=8 centimeters, find DN

If EN=12 feet, what is the diameter of the circle?

In other words circle A has a diameter of 8 inches, circle B has a diameter of 18 inches, and circle C has a diameter of 11 inches.

Find the length of FB

Find the circumference of this circle.

You have to find the diameter first. You will use Pythagorean Theorem for that.

8²+12²=x²

Once you find that you will multiply that times π.