Parts of a Circle
Area & Circumference
Angles in a Circle
Equations of a Circle
Mixed Review
100
This is a segment that has endpoint on the center of the circle and the circumference.
Radius
100
What are both of the formulas for circumference?
C = 2*pi*r
C = pi*d
100
True or False: A central angle is equal to it's intercepted arc's measure.
True!
100
Write an equation: Center: (4,5) Radius = 3
(x - 4)2 + (y - 5)2 = 9
100
Can someone please tell me the difference between arc measure & arc length?!
Arc measure is in DEGREES. Arc length is in units (cm, in, yd... depends on the radius.) You need a formula to solve for arc length.
200
This is the location at which the tangent line intersects the circle.
Point of Tangency
200
In terms of pi... What is the circumference of a circle whose radius is 8?
16 pi
200
What's the relationship between an inscribed angle and it's intercepted arc?
Inscribed angle is HALF the arc measure.
200
Write an equation: Center (-3, 8) Radius = 13
(x + 3)2 + (y - 8)2 = 169
200
How can we tell if a tangent line is perpendicular to a radius?
Pythag
300
You use this point to name a circle.
Center
300
In terms of pi... What is the area of a circle whose radius is 9?
81 pi
300
In an inscribed quadrilateral, opposite angles are ___________.
Supplementary
300
Write an equation: Center (9, 0) Radius =
sqrt 75
(x - 9)2 + y2 = 75
300
Do the following sides form a right triangle?
13.2 in, 15.2 in, 20.5 in
No... if you type it into your calculator it will come out as false!
400
True or False: A diameter is a chord.
True
400
In terms of pi... What is the area of a circle whose diameter is 20?
100 pi
400
If two inscribed angles share the same intercepted arc, then those two angles are ____________.
Congruent
400
Write an equation: Center (0, 0) Diameter = 18
x2 + y2 = 81
400
If tangents meet at an external point, then those line segments are __________.
Congruent!
500
Recall four parts of a circle that you can name with three letters.
Semicircle, major arc, central angle, & inscribed angle.
500
Might need calculator or scrap paper.
A circle's circumference is 56 in. What is it's area? Must say answer with correct units.
About 249.682 in^2
500
What is the measure of arc RQ?
54 degrees
500
Write an equation: Center: (-5, 7) Point on circle: (-2, 9)
(x + 5)2 + (y - 7)2 = 13
500
Calculate the LENGTH of the orange arc. You must say your answer in correct units.
About 5.23 yd