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Warm-Up. Multiply. 1.89 x 97 2.234 x 76 3.837 x 34 4.38 x 28. 10.7 Circumference and Area: CIRCLES. Pre-Algebra. Sir Cumference and the Dragon of Pi Circumference of Circles. Parts of a circle!. Circumference The distance AROUND the circle Center

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Warm-Up

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• Multiply.

• 1.89 x 97

• 2.234 x 76

• 3.837 x 34

• 4.38 x 28

Pre-Algebra

## Sir Cumference and the Dragon of PiCircumference of Circles

### Parts of a circle!

• Circumference

• The distance AROUND the circle

• Center

• The given point in the very middle

• The distance from the CENTER to ANY point on the circle

• Diameter

• The distance across the circle THROUGH its center

### Circumference

• Formulas

• C=2 r

• C = d

• C is Circumference

• is 3.14

• d is diameter

### Area

• A = r2

• A is the Area

• Pi is 3.14

• R is the radius squared

• FORMULA

• WORK

• UNITS

### Examples

• 1.Find the circumference and area of the circle if:

• r = 2 cm

### Examples

• 2.Find the circumference and area of the circle if:

• d = 6 in

• 3.

12 in.

• 4.

7.1 m

• 5.

11 ft

• 6.

8.3 cm

### 10.7 Study Guide and Intervention

Write ALL formulas EVERY time and SHOW all work!