In the given circle, $S$ is the center. $JK = 4x - 2$, $LM = 10$, $SN = 8$, and $SP = 8$. $SN$ and $SP$ are perpendicular to chords $JK$ and $LM$, respectively. We need to find the values of $x$ and $PL$.

GeometryCirclesChordsGeometric ProofAlgebraic Equations
2025/4/29

1. Problem Description

In the given circle, SS is the center. JK=4x2JK = 4x - 2, LM=10LM = 10, SN=8SN = 8, and SP=8SP = 8. SNSN and SPSP are perpendicular to chords JKJK and LMLM, respectively. We need to find the values of xx and PLPL.

2. Solution Steps

Since SS is the center of the circle and SNSN and SPSP are perpendicular to chords JKJK and LMLM respectively, SNSN bisects JKJK and SPSP bisects LMLM. Therefore, JN=12JKJN = \frac{1}{2}JK and LP=12LMLP = \frac{1}{2}LM. Also, SN=SP=8SN = SP = 8, which means the chords JKJK and LMLM are equidistant from the center. Hence, they must have equal lengths. Therefore, JK=LMJK = LM.
So, we have 4x2=104x - 2 = 10.
Now, we solve for xx:
4x2=104x - 2 = 10
4x=10+24x = 10 + 2
4x=124x = 12
x=124x = \frac{12}{4}
x=3x = 3
Now, we find PLPL. Since LP=12LMLP = \frac{1}{2}LM and LM=10LM = 10,
LP=12(10)LP = \frac{1}{2} (10)
LP=5LP = 5

3. Final Answer

x=3x = 3
PL=5PL = 5

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