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### 10.7 Circumference and Area: CIRCLES

### Sir Cumference and the Dragon of PiCircumference of Circles

Warm-Up

- Multiply.
- 1. 89 x 97
- 2. 234 x 76
- 3. 837 x 34
- 4. 38 x 28

Pre-Algebra

Parts of a circle!

- Circumference
- The distance AROUND the circle

- Center
- The given point in the very middle

- Radius
- 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
- r is radius
- d is diameter

SHOW ALL OF YOUR WORK EVERY TIME!!!!!

- FORMULA
- WORK
- ANSWER
- 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

10.7 Study Guide and Intervention

Write ALL formulas EVERY time and SHOW all work!

Homework!Write ALL formulas EVERY time and SHOW all work!

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