Maths help geometry :D
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Maths help geometry :D

[From: ] [author: ] [Date: 11-10-17] [Hit: ]
x is the half length of the chord, the full length is twice of it,20 * 2 = 40 cm.Answer mine?http://answers.yahoo.......
The chord of a circle is 15 cm away from the center.The radius of the circle is 25cm.Find the length of the chord.

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<< quoted>>
25² =15² + x² ; <== 25 is the radius and 15 is the distance from center to the chord
; it forms a right triangle

x² = 25² - 15² ; <-- normal calculation

x² = 400 ; <-- normal calculation

x=20cm ; <-- so far so good, BUT this is not the answer.

x is the half length of the chord, the full length is twice of it,

20 * 2 = 40 cm. <-- THIS IS THE ANSWER!!

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length of the cord = 20 cm

Answer mine?
http://answers.yahoo.com/question/index;…

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25² =15² + x²
x² =25²-15²
x²=400
x=20cm
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