Download 12.2 Part 1 Notes - Garnet Valley School District

Geometry B
Date: ____________
12.2 – Arcs and Chords
Objective: To apply properties of arcs and chords
Definitions:
 Central Angle - __________________________________________________________

Arc - ___________________________________________________________________
________________________________________________________________________
Naming Arcs
 Minor arcs may be named by only _______ points.
 Major arcs must be named by _________ points.
Ex. 1: Data Application
a. The circle graph shows the types of
grass planted in the yards of one
neighborhood. Find mKLF.
b. Use the graph to find each of the following
FME ___________
FMC ___________
HG _____________
AC ______________
CHA ____________

Adjacent Arcs - _______________________________________________________
Ex. 2: Using the Arc Addition Postulate
a. Find mBD
b. Find mJKL and mLJN
Properties of Chords
1. If two chords are congruent, their central
angles and arcs are ___________________
(and the reverse is true also).
2. If two central angles are congruent, their
chords are ______________________
Ex. 2: Applying Congruent Angles, Arcs, and Chords
___
____
a. TV  WS . Find mWS
b. C  J, and mGCD  mNJM. Find NM
HW: 12.2 Worksheet