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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


10 7 circumference and area circles

10.7 Circumference and Area: CIRCLES

Pre-Algebra


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


Warm up

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!


    Do not just guess show work

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


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