mfgh - mrsesposito · 12.2 arcs and chords key vocabulary word definition picture central angle arc...
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12.2 Arcs and Chords Key Vocabulary
Word Definition Picture
Central Angle
Arc
Minor Arc
Major Arc
Semicircle
More about Arcs!!
Word Definition Picture
Adjacent Arcs
Arc addition
Postulate
Congruent Arcs
Practice
1) mHJ 2) mCDE
mFGH mBCD
Angle and Chord Theorems
Theorem Hypothesis Conclusion
Congruent central angles have congruent chords.
mBEA mCED
.BA CD
Congruent chords have congruent arcs.
BA CD
.BA CD
Congruent arcs have congruent central angles.
BA CD
mBEA mCED
Practice: Find the value of the variable and the missing measures.
1) 2)
3) 4)
More Theorems!!!
Theorem Hypothesis Conclusion In a circle, if a radius or diameter is perpendicular to a chord, then it bisects the chord and its arc.
In a circle, the perpendicular bisector of a chord is a radius. (or diameter)
Practice:
1) Find NP 2)Find LN
More Practice!
1) Find mNGH and HL 2) Find mUTW
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