Book Definitions
Measure
Radius/Diameter
Circle Equations
Key Concepts
100
A segment with endpoints on the circle.
What is a chord?
100
Arc measure with a central angle of 80.
What is 80?
100
Radius is 2.
What is diameter of 4?
100
Center at (0, 0) and Radius of 2
What is x^2 + y^2 = 4?
100
The sum of the measures of the central angles of a circle.
What is 360?
200
A chord that passes through the center of the circle.
What is the diameter?
200
Inscribed angle corresponding to a central angle of 90.
What is 45?
200
Diameter is 8.
What is radius of 4?
200
Center at (0, 4) and Radius of 3
What is x^2 + (y - 4)^2 = 9?
200
The circumference of a circle.
What is pi * d or 2 * pi * r?
300
An angle with the vertex in the center of the circle.
What is a central angle?
300
One of the central angles of a circle divided evenly into 3 sectors.
What is 120?
300
Circumference equals 16pi.
What is radius 8 or diameter 16?
300
Center at (5, 0) and Radius of 5
What is (x - 5)^2 + y^2 = 25?
300
The measure of an inscribed angle is half the measure of this.
What is the intercepted arc?
400
Endpoints on the sides of an inscribed angle lies in the interior of the inscribed angle.
What is an intercepted arc?
400
The arc measure and central angle of a semicircle.
What is 180?
400
Circumference = pi.
What is radius is .5 or diameter is 1?
400
Center at (-2, 4) and Passes through (-6, 7)
What is (x + 2)^2 + (y - 4)^2 = 25?
400
Two segments tangent to a circle from the same exterior point.
What is congruent?
500
A line in the same plane as a circle that intersects the circle in exactly one point.
What is a tangent line?
500
Circumference of the helipad with a diameter of 60 feet.
What is 60pi?
500
x^2 + y^2 = 144
What is radius is 12 or diameter is 24?
500
(x - 4)^2 + (y + 1)^2 = 9
What is center at (4, -1) and Radius of 3?
500
The equation of a circle with center (h, k) and radius r.
What is (x - h)^2 + (y - k)^2 = r^2?
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