ANGLES
An angle which is made up of two radii whose vertex is the center of the circle.
central angle
The name of a segment whose endpoints are on a circle
chord
This has the same measure of the central angle.
intercepted arc
An arc whose measure is less than 180 degrees
minor arc
An angle that is more than 90 degrees
obtuse angle
The measure of an intercepted arc of a central angle is 450 , the measure of the central angle is ____________ .
450
This is a line that intersects the circle at two points.
secant
The vertical angles made by intersecting chords in a circle.
interior angles
An arc which has a measure of exactly 180 degrees
semicircle
Area formula and circumference formula for a circle
r2 and 2πr or πd
The sum of the measures of the central angles of a circle with no common interior points.
3600
The special type of chord which passes through the center of the circle
diameter
An arc of a circle whose measure is greater than that of a semicircle.
major arc
The distance along the curved line making up the arc. it can be determined by using the proportion A/360=l/(2πr)
arc length
formula to find arc length
A/360=l/(2πr)
The measure of a central angle is ________________ the measure of its intercepted arc.
equal or the same as
This is a line which intersects the circle in exactly one point.
tangent
The measure of the major arc if the minor arc's measure is 40 degrees
320
The point of intersection between a circle and its tangent line or line segment
point of tangency
Type of triangle that has 2 sides congruent
isosceles triangle
The measure of the central angle of a circle is 1220. The measure of its intercepted arc is ______________.
1220
If the diameter is 42 cm, then the radius is _______.
21
The measure of the angle formed by a radius and its tangent line.
90 degrees
A part of a circle
Arc
The distance formula is derived from this theorem.
Pythagorean Theorem