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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
Warm-Up

  • Multiply.

  • 1. 89 x 97

  • 2. 234 x 76

  • 3. 837 x 34

  • 4. 38 x 28



Sir cumference and the dragon of pi circumference of circles

Sir Cumference and the Dragon of PiCircumference of Circles


Parts of a circle
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
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
    SHOW ALL OF YOUR WORK EVERY TIME!!!!!

    • FORMULA

    • WORK

    • ANSWER

    • UNITS


    Examples
    Examples

    • 1. Find the circumference and area of the circle if:

      • r = 2 cm


    Examples1
    Examples

    • 2. Find the circumference and area of the circle if:

      • d = 6 in


    Find the circumference and area to the nearest tenth
    Find the circumference and area to the nearest tenth.

    • 3.

    12 in.


    Find the circumference and area to the nearest tenth1
    Find the circumference and area to the nearest tenth.

    • 4.

    7.1 m


    Find the circumference and area to the nearest tenth2
    Find the circumference and area to the nearest tenth.

    • 5.

    11 ft


    Find the circumference and area to the nearest tenth3
    Find the circumference and area to the nearest tenth.

    • 6.

    8.3 cm


    10 7 study guide and intervention
    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
    Homework!Write ALL formulas EVERY time and SHOW all work!



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