1. 10.1 Circles and Circumference
What you’ll learn:
To identify and use parts of circles.
To solve problems involving the circumference of a circle.

2. Vocabulary
Circle – the set of all points in a plane equidistant from a given point called the center of the circle. Symbol: Named by the center Radius – the distance from the center to the circle (all radii in a circle are equal) Chord – a segment that connects 2 point on a circle. Diameter – a chord that goes through the center. Circumference – the distance around a circle. Formula: C=πd and C=2πr. A B C D E F

3. Use the figure to answer the questions.
Name the circle
Name a radius of the circle.
Name a chord of the circle
Name a diameter of the circle. A B C D E

4. The diameters of X, Y, and Z are 22 mm, 16mm, and 10mm respectively
Find EZ
Find XF E X Y F Z G

5. Find C if r=13 cm
Find C if d=6 in
3. Find d and r to the nearest hundredth if C=65.4 feet.

6. Find the exact circumference of K.
C=πd C=6π K

7. Homework p even