Finding the Radius of a Circle with Known Circumference

Q.

Find the circumference of the object. Use $3.14$ or $\frac{22}{7}$ for $\mathrm{\pi }$.

Q.

The Circumference $C$ of a circle is equal to $2\mathrm{\pi }\times$ _____. Fill in the blanks.

Q. Find the diameter of a circle whose circumference is $10\pi$ cm.

1. $10$ cm
2. $5$ cm
3. $20$ cm
4. $\pi$ cm

Q. The total cost of fencing a circular garden at the rate of$\$3$ per meter is$\$120\pi$ . Find the radius of the garden.
m

Q.

The Circumference of a Circle can be found by multiplying Its diameter $d$ With

Q.

Find the perimeter of the semicircular region.

Q. The circumference of a circle is approximately equal to $157units$. Taking the value of $\pi =3.14$, what is the radius of the circle?

1. $r=10units$
2. $r=15units$
3. $r=20units$
4. $r=25units$

Q. If a semicircle has a circumference of $(8+4\pi )$ m, then its:

1. $\text{radius = 2 m}$
2. $\text{radius = 4 m}$
3. $\text{area = 8}\pi \text{m}{}^2$
4. $\text{area = 16}\pi \text{m}{}^2$

Q. The circumference of a circle is $28\pi units$. What is the diameter of the circle?

1. $d=20units$
2. $d=24units$
3. $d=28units$
4. $d=32units$

Q. If the circumference of the below circle is $4\pi$ units, then the length of $AB$ is

1. $\sqrt{2}$
2. $4$
3. $4\sqrt{2}$
4. $2\sqrt{2}$

Q.

Find the circumference of the object. Use $3.14$ or $\frac{22}{7}$ for $\mathrm{\pi }$.