warm-up multiply. 1.89 x 97 2.234 x 76 3.837 x 34 4.38 x 28

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

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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 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

FormulasC=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!!!!!

FORMULAWORKANSWERUNITS

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 InterventionWrite ALL formulas EVERY time and

SHOW all work!

Homework!Write ALL formulas EVERY time and SHOW all

work!

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