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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

  • 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


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


Area

  • A = r2

  • A is the Area

  • Pi is 3.14

  • R is the radius squared


  • 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


    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


    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!


    Do not just Guess!!! Show WORK!!!!


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