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# Warm-Up - PowerPoint PPT Presentation

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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Presentation Transcript

• 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

• 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

• Formulas

• C=2 r

• C = d

• C is Circumference

• is 3.14

• d is diameter

• A = r2

• A is the Area

• Pi is 3.14

• R is the radius squared

• FORMULA

• WORK

• 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

Find the circumference and area to the nearest tenth.

• 3.

12 in.

Find the circumference and area to the nearest tenth.

• 4.

7.1 m

Find the circumference and area to the nearest tenth.

• 5.

11 ft

Find the circumference and area to the nearest tenth.

• 6.

8.3 cm

Write ALL formulas EVERY time and SHOW all work!

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