Circle Vocabulary
Tangent Lines
Segments in a Circle
Circumference
Coordinate Plane
100
The line that cuts a circle exactly in half.
Diameter
100
How many times does a tangent line hit a circle?
Once
100
Solve for x:
x = 7
100
The circumference is the ___________ of a circle.
perimeter
100
In the equation (x - h)2 + (y - k)2 = r2, what does (h, k) represent?
The center of the circle
200
The line that is half the distance of the diameter
radius
200
A tangent line is __________ to the radius drawn to the point of tangency
perpendicular
200
Solve for PD.
PD = 6.4 cm
200
What is the formula to find the circumference of a circle?
C = pi*d or C = pi*2r
200
What is the diameter of the circle?
(x - 3)2 + (y + 3)2 = 9
diameter = 6
300
A piece of the circumference
arc
300
What shape is created from two tangent lines to one circle that start at the same point?
Kite
300
If PC = x2 and QC = 9, find x.
x = 3
300
What are the first three digits of pi?
3.14
300
Write an equation for a circle with radius = 9 and center at (2, 0).
(x - 2)2 + y2 = 81
400
A portion of the area of a circle.
sector
400
Two tangent lines drawn from the same point outside the circle are _______________.
Congruent/same length
400
True or False: If angle A = 90o, then AB is a tangent line.
True
400
What is the circumference of a circle with a radius of 10 yards? Leave pi in your answer.
10*pi yards
400
What are the coordinates of the center of the circle whose equation is:
(x - 4)2 + (y + 1)2 = 6
(4, -1)
500
A line that crosses a circle twice.
secant
500
Solve for the radius, x.
x = 8
500
If BD = BC, what kind of triangle is DBC?
equilateral triangle
500
What is the radius of a circle with a circumference of 10*pi yards?
radius = 5 yards
500
Which quadrant is this circle located in?
Quadrant 3