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 ID: 239090
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Slide1
10.1 Circles and circumferences
Ms. AndrejkoSlide2
Vocabulary
Radius- a segment with endpoints at the center and on the circleChord- 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 circleSlide3
Diameter (chord)
chord
radius
centerSlide4
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 centerSlide5
Even More vocabulary
A polygon is inscribed in a circle if all of its vertices lie on the circleA circle is
circumscribed
about a polygon if it contains all vertices of the polygon
Circumference:
C =
π
dSlide6
Examples
Name the circle. Name a radius.
Name a chord.Slide7
Practice
Name the circle. Name a radius.
Name a chord.Slide8
Examples
The diameters of circle L and circle M are 20 and 13 units, respectively, and QR = 4.4. LQ=
5. RM=Slide9
Practice
The diameters of ⊙F and ⊙G are 5 and 6 units, respectively. Find each measure.4. BF=
5. AB=Slide10
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 mSlide11
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 mSlide12
Examples
Find the circumference:
9.
10.Slide13
Practice
Find the circumference:
9.
10.