General Circle Vocab
This is the distance from the center of the circle to the edge of the circle.
What is the radius?
This arc, less than 180 degrees, is denoted using two points along the circle.
What is a minor arc?
If the vertex of the angle is here, then its measure is the same as the measure of the arc.
Where is the center of the circle?
In circle G with major arc ABC, if line segment GA measures 3 cm, then line segments GB and GC measure this long.
What is 3 cm?
This is a segment that has endpoints on the circle (not necessarily going through the center of the circle).
What is a chord?
This arc, greater than 180 degrees, is denoted using three points along the circle.
What is a major arc?
If the vertex of the angle is on the circle, the measure of the angle is found by doing this to the measure of the arc.
What is half?
In circle R, if chord PQ is congruent to chord ST, that also means that these are congruent.
What are arc PQ and arc ST?
or,
What are angle PRQ and angle SRT?
This is a continuous line that intersects the circle at one point.
What is a tangent?
All arcs along a circle must combine to equal this.
What is 360 degrees?
To find the measure of an angle that's formed inside the circle (not at the center), we must do this.
What is add the arcs and divide by 2?
Chord PQ intersects with chord AB at point G. If PG=8, GQ=5, AQ=10, then QB=this.
What is 4?
This is a continuous line that intersects the circle at two points.
What is a secant?
If we know that two adjacent arcs create a semicircle, then we know that their measures must total to this number.
What is 180 degrees?
To find the measure of an angle that's formed outside of the circle, we must do this.
What is subtract the arcs and divide by 2?
If the Pythagorean Theorem gives you (x+2)2=32+42, you might FOIL/distribute the (x+2)(x+2), but it's easier if you do this.
What is taking the square root of both sides?
This is the name of the location where the tangent line intersects the circle.
If circle C has an arc AB that measures 60 degrees, we also know that this has a measure of 60 degrees.
What is angle ACB?
This is the angle that is formed when a radius bisects a chord.
What is a right angle?
Segment AB is tangent to the circle at point B with a measurement of 10 inches. Segment AH is not tangent and intersects the circle at point G (between A and H) as well as point H. Segment AG measures 5 inches, and segment GH measures this.
What is 15 inches?