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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

10.7 Circumference and Area: CIRCLES

Pre-Algebra

Sir Cumference and the Dragon of PiCircumference of Circles

- 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

- Formulas
- C=2 r
- C = d
- C is Circumference
- is 3.14
- r is radius
- d is diameter

- A = r2

- FORMULA
- WORK
- ANSWER
- UNITS

- 1.Find the circumference and area of the circle if:
- r = 2 cm

- 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

Write ALL formulas EVERY time and SHOW all work!