10 1 CIRCLES AND CIRCUMFERENCES Ms Andrejko VOCABULARY
10. 1 CIRCLES AND CIRCUMFERENCES Ms. Andrejko
VOCABULARY Radius- a segment with endpoints at the center and on the circle Chord- segment with both endpoints on the circle Diameter- chord that passes through the center and has endpoints on the circle Circle- the set of all points in a plane equidistant from a given point called the center of a circle
radius Diameter (chord) ch or d center
MORE VOCAB…. Congruent circles- two circles are congruent circles if and only if they have congruent radii Concentric circles- coplanar circles that have the same center
EVEN MORE VOCABULARY A polygon is inscribed in a circle if all of its vertices lie on the circle A circle is circumscribed about a polygon if it contains all vertices of the polygon Circumference: C = πd
EXAMPLES 1. Name the circle. 2. Name a radius. 3. Name a chord.
PRACTICE 1. Name the circle. 2. Name a radius. 3. Name a chord.
EXAMPLES The diameters of circle L and circle M are 20 and 13 units, respectively, and QR = 4. 4. LQ= 5. RM=
PRACTICE The diameters of ⊙F and ⊙G are 5 and 6 units, respectively. Find each measure. 4. BF= 5. AB=
EXAMPLES Find the diameter, radius, and circumference of a circle with the given information. 6. r = 21 ft 7. d = 18 cm 8. C = 6π m
PRACTICE Find the diameter, radius, and circumference of a circle with the given information. 6. r = 17 ft 7. d = 26 cm 8. C = 22π m
EXAMPLES 9. Find the circumference: 10.
PRACTICE 9. Find the circumference: 10.
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