1. TAB 1 TAB 1 TAB 1 TAB 1 Geometry/Trig Name: __________________________
Unit 8 GSP Circles Lab Date: ___________________________
Circles Day 2 - Sections 9-3, 9-4
Theorem 9-4
TAB 1
Sketch the diagram:
Fill in the Measurements: AB BC
mAGB
mBHC
TAB 1
Conclusion (Theorem 9-4): In the same circle or in congruent circles, congruent chords intercept ___________________ arcs.
Examples: Find all angle and arc measures.
mÐCAB = 40
mÐACB = ________ mÐABC = _______
mAB = 140
mAC = __________ mCB = _________ A B C
TAB 1
Q is the center of the circle.
mAB = 86
mDC = _______ mÐDQC = ______
Classify DDQC by sides: _____________
mBC = 128 mBAC = ___________ A B C D Q
TAB 1

2. Circles Day 2 (Sections 9-3, 9-4) – page 2
Geometry/Trig
Unit 8 GSP Circles Lab
Circles Day 2 (Sections 9-3, 9-4) – page 2
Theorem 9-5
TAB 2
Sketch the diagram:
Fill in the Measurements: AF FB
mAGC
mBHC
TAB 2
Conclusion (Theorem 9-5): A diameter that is perpendicular to a chord _________________ the chord and its intercepted arc.
Examples (Q is the center of each circle).
Given:
QJ = 3, QL = 3, KP = 8 R M S T Q 15 17 P
RT = ________
QM = ________
QS = ________
MS = ________
SP = ________
TAB 2
mAB = _______
mAC = _______
mCB = _______
mÐAQC = _______
mÐAQB = _______
mÐABQ = _______ Q B C A D
mADB = 220 F
JP = _______
NM = _______
LM = _______
LN = _______
QM = _______
QK = _______
(d) mÐQNL = __________
TAB 2
(d) Challenge: If QC = 10, find AB.