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Warm-Up

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

  2. 10.7 Circumference and Area: CIRCLES Pre-Algebra

  3. Sir Cumference and the Dragon of PiCircumference of Circles

  4. 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

  5. Circumference • Formulas • C=2 r • C = d • C is Circumference • is 3.14 • r is radius • d is diameter

  6. Area • A = r2 • A is the Area • Pi is 3.14 • R is the radius squared

  7. SHOW ALL OF YOUR WORK EVERY TIME!!!!! • FORMULA • WORK • ANSWER • UNITS

  8. Examples • 1. Find the circumference and area of the circle if: • r = 2 cm

  9. Examples • 2. Find the circumference and area of the circle if: • d = 6 in

  10. Find the circumference and area to the nearest tenth. • 3. 12 in.

  11. Find the circumference and area to the nearest tenth. • 4. 7.1 m

  12. Find the circumference and area to the nearest tenth. • 5. 11 ft

  13. Find the circumference and area to the nearest tenth. • 6. 8.3 cm

  14. 10.7 Study Guide and Intervention Write ALL formulas EVERY time and SHOW all work!

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

  16. Do not just Guess!!! Show WORK!!!!

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