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Transcript of 6.6
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6.6 Find Segment Lengths in Circles
Theorem 6.16 Segments of ChordsIf two chords intersect in the interior of a circle, then the product of the lengths of the segments of one chord is equal to the product of the lengths of the segments of the other chord.
_____ EC_____EA B
A
C
D
EEB ED
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6.6 Find Segment Lengths in Circles
Example 1 Find lengths using Theorem 6.16Find lengths using Theorem 6.16
Find ML and JK.
K
M
L
J
N5x
3xx
1x
____ ____ NJNK NL NM
____ ____5 xx 3x 1x_________52 xx 2x x4 3___x 3
Find ML and JK by substitution.
____ ____ ML 3x 1x__ __ __ __ 3 3 3 1
___ 10
____ __ JK x 5x__ __ __ 3 3 5
___ 11
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6.6 Find Segment Lengths in Circles
Theorem 6.17 Segments of SecantsIf two secant segments share the same endpoint outside a circle, then the product of the lengths of one secant segment and its external segment equals the product of the lengths of the other secant segment and its external segment.
_____ EDEA _____ EB EC
B
A
CD
E
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6.6 Find Segment Lengths in Circles
Example 2 Find lengths using Theorem 6.17Find lengths using Theorem 6.17
RTRSRPRQ __ ________ x6 6
Q
R
P
S
T
Solution
Use Theorem _____6.17
Substitute.
x 5
64Find the value of x.
4 5 5Simplify.___ _____ x60 5 25Solve for x.x__7
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6.6 Find Segment Lengths in CirclesCheckpoint. Find the value of Checkpoint. Find the value of xx..
1.
x
5 126
x 6 5 12x6 60
10x
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6.6 Find Segment Lengths in CirclesCheckpoint. Find the value of Checkpoint. Find the value of xx..
2.
x
7
8
66 14 7 7x
84 497 x
5x35 x7
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6.6 Find Segment Lengths in Circles
Theorem 6.18 Segments of Secants and TangentsIf a secant segment and a tangent segment share an endpoint outside a circle, then the product of the lengths of the secant segment and its external segment equals the square of the length of the tangent segment.
____ ____EA2 ED EC
E
A
C
D
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Q
S
R
T
6.6 Find Segment Lengths in Circles
Example 3 Find lengths using Theorem 6.18Find lengths using Theorem 6.18
___2 RSRQ _____ __ 2 x14
Solution
Use Theorem _____6.18
Substitute.
x
12
14Find RS.
12xSimplify.xx _____ 2 196 12Write in standard form._____0 2 xx 12
RT
196Use quadratic formula.
__2
_____4_____0
2
12 12 1 1961
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Q
S
R
T
6.6 Find Segment Lengths in Circles
Example 3 Find lengths using Theorem 6.18Find lengths using Theorem 6.18
________x
Solution
Simplify.
x
12
14Find RS.
5826 Lengths cannot be __________, so use the _________ solution.
negative positive
So, x = ___________5826 ____, 23.9 .____RS and 23.9
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M J
K
L
6.6 Find Segment Lengths in CirclesCheckpoint. Complete the following exercise.Checkpoint. Complete the following exercise.
JK. Find 3.
x
8
6
28x 6x64xx 62
06462 xx___64___62 xx
23x 73
x 733
9 9
3x 73733JK
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6.6 Find Segment Lengths in Circles
Pg. 231, 6.6 #1-24