We are given a circle with center $A$. We have two chords, $BE$ and $CD$. We are given that $BE = 36$ and $CD = 32$. $AF$ is perpendicular to chord $CD$. We need to find the length of $AF$.

GeometryCircleChordsPythagorean TheoremRight Triangle
2025/4/29

1. Problem Description

We are given a circle with center AA. We have two chords, BEBE and CDCD. We are given that BE=36BE = 36 and CD=32CD = 32. AFAF is perpendicular to chord CDCD. We need to find the length of AFAF.

2. Solution Steps

Let the radius of the circle be rr.
Since BE=36BE = 36, the radius r=AE=AB=362=18r = AE = AB = \frac{36}{2} = 18.
Since AFAF is perpendicular to CDCD, FF is the midpoint of CDCD.
Therefore, CF=CD2=322=16CF = \frac{CD}{2} = \frac{32}{2} = 16.
In the right triangle ACFACF, we have AC=r=18AC = r = 18 and CF=16CF = 16. By the Pythagorean theorem, we have
AC2=AF2+CF2AC^2 = AF^2 + CF^2
182=AF2+16218^2 = AF^2 + 16^2
324=AF2+256324 = AF^2 + 256
AF2=324256=68AF^2 = 324 - 256 = 68
AF=68=417=217AF = \sqrt{68} = \sqrt{4 \cdot 17} = 2\sqrt{17}
We need to round the answer to the nearest hundredth.
AF=2172(4.123)8.246AF = 2\sqrt{17} \approx 2(4.123) \approx 8.246
Rounding to the nearest hundredth, we have AF8.25AF \approx 8.25.

3. Final Answer

8.25

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