Circles in Terms of Pi

Presentation

•

Mathematics

•

7th Grade

•

Hard

Joseph Anderson

FREE Resource

6 Slides • 2 Questions

Circumference and Area of a Circle Process steps

How do I find the circumference using the formula?

1. Determine if you are given the radius or the diameter.
2. Choose your formula. If you are given the diameter, then use

C=\pi d

If you are given the radius, use

C=\ 2\pi r

3. Plug in what you know. Use 3.14 for pi.
4. Multiply.

**Sometimes, you will be asked to leave your answers in terms of pi. So, leave the pi symbol in your answer and multiply everything else.

Let's try it out !!

A cruise ship has a large, circular window with a diameter of 22 meters. Approximately what is the window's circumference?

**Use 3.14 for Pi.

Now you try!!

Use your process Steps!! PUT YOUR WORK ON PAPER!

Multiple Choice

The radius of the circle is 9 meters. What is the circle's circumference?

**Use 3.14 for Pi.

56.52 m

28.26 m

18 m

How do I find the area using the formula?

1. Determine if you are given the radius or the diameter. **If the diameter is given, divide it by 2 to get your radius.
2. $A=\pi r^2$ where $r^2=r\cdot r$

3. Plug in what you know. Use 3.14 for pi.
4. Multiply.

**Sometimes, you will be asked to leave your answers in terms of pi. So, leave the pi symbol in your answer and multiply everything else.

Find the area of a circle if the diameter is 12 inches. Use 3.14 for pi.

Remember your formula:
$A=\pi r^2$
Notice: You are given the diameter. But, the formula uses the radius. So, you must divide the diameter by 2, to find the radius. 12/2= 6 inches.
Now, plug in what you know.
$A=3.14\left(6\right)^2$
$A=3.14\left(36\right)$
A=113.04 $in^2$

Multiple Choice

What is the area of this circle? Use 3.14 for pi.

12.56

25.12

50.24

200.96

Circumference and Area of a Circle Process steps

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