Circle Note cards
description
Transcript of Circle Note cards
Are you ready? We heard you were going to make a few note cards - and then there might
be a short quiz. Have fun!!
White note card
circle
The set of all points in a plane that are equidistant from a given point
center
radius
diameterchordsNamed by its center: ОD D
Colored Note card
Circle formulas
Circumference: 2rArea: r²
Arc - part of a circle
Arc measure: a) degrees: equal to the measure of the
central angleb) length: central angle arc length
360° circumference =
Central angle
Major arc
Minor arc
This circle stuff is AWESOME!!
Hey, how about a quiz? That would
be fun!
You’re right! Everyone take out a piece of paper!
QUIZ
1.Draw circle E. Draw and label a radius, diameter, and a chord that is not a diameter.
2.Find the exact circumference and area of circle Q.
3.Name a minor arc in the circle.
4.Name a major arc in the circle.
5.Find the arc length of BC.
A B
C
Q95°
14 cm
Guess what!?! There is even more stuff to learn
about circles!
Colored note card
Angles in circles
Central angle • vertex is center of circle• sides are radii• measure is equal to arc
85°
85°
Inscribed angle• vertex is on circle• sides are chords• measure is half the arc
43°
86°
Try these! Find x.
x°
110°
56°
x°
36°
x°
x°
160°
Colored note card
Diameters and chords
congruent chords are equidistant from center
congruent chords = congruent arcs
diameter to chord – diameter bisects chord and arc
How about these? Math is good stuff!
8
6
Find the radius.3
x
12
y
Find x and y.
One more problem! Find the arc length of the minor
arc.
43°
4 cmcentral angle arc length 360° circumference
=
86360
X2 • • 4=
Think about the measure
of the arc. It’s not 43°!
86°
86°
Circumference: 2r
or 3.14?
Nice job!
X 1.91 6
More problems to do, there are, young Padawan.
Some with
factoring?
Factoring in two.
Fun in all of them.
More to learn, there is, young Padawan.
Tangents and secants to study, you must.
Secants and
tangents?
Secants and
tangents.