​LET'S REVIEW

​NEW INFORMATION

Circles have many different parts which we use in math.

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We are going to go through them before moving on to how to find circumference.​

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​The Parts of a Circle

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RADIUS

DEFINITION: The distance halfway across a circle- from center to circumference (half the diameter).

FORMULA: Diameter/2

DIAMETER

DEFINITION: The full distance across a circle -from one side to the opposite side passing through the center

FORMULA: Radius x 2

​NEW INFORMATION

Circumference

Pi

The ratio of a circle's circumference to its diameter.

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Used to calculate the circumference and area of a circle.

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USE 3.14 to represent PI​

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Solve a Circumference Problem

1. Write the formula

2. Substitute the values

3. Multiply

4. Write the unit of measure

​TIME TO PRACTICE

Independent Work:

• Parts of a circle

• ​Circumference of a Circle

• Find the circumference of a circle when given diameter

​Some text here about the topic of discussion.

Independent Work