Warm-Up  Multiply.  1.89 x 97  2.234 x 76  3.837 x 34  4.38 x 28.

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Presentation transcript:

Warm-Up  Multiply.  1.89 x 97  x 76  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 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 = r 2  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.  in.

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

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

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