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circles

QuestionAnswer
Central Angle Angle = Arc
Inscribed Angle Angle = 1/2 Arc Arc = 2 Angles
Inscribed Triangle Sum of the arcs = 360 Sum of the angles in the triangle = 180 Double an angle to find the arc Cut an arc in half to find the angle
Inscribed quadrilateral Sum of the arcs = 360 Sum of the angles in the quadrilateral = 360 Double an angle to find the arc Cut an arc in half to find the angle
DIAMETER!!! CUTS THE CIRCLE IN 1/2 A LINE THAT GOES ACROSS THE WHOLE CIRCLE
Two Chords AB = CD
Two Tangents Intersection (where the tangents meet) is equidistant to the point of tangency (where the tangents meet the circle)
Radius/Diameter and Chord RIGHT TRIANGLES!! Diameter/radius cuts the chord in half. Diameter/radius makes a 90 degree angle to chord RIGHT TRIANGLE!!
Radius/Diameter and Tangents Diameter/radius makes a 90 degree angle to the tangent RIGHT TRIANGLE!!
Created by: Mrs.Stichter