Measurement of arch

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sanjib
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Topic: Measurement of arch
PostFri Jul 03, 2009 6:56 am Reply with quote
See the picture in the attachment please.

What is the circumference of the circle in the attachment.
(1) The length of arc XYZ is 18.
(2) r = s


Need explanation please :
if the angle made in the circle are based on the circle points as vertex , is the angle double if it is made by one point was in the centre .
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El Cucu
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PostFri Jul 03, 2009 11:42 am Reply with quote
sanjib wrote:
See the picture in the attachment please.

What is the circumference of the circle in the attachment.
(1) The length of arc XYZ is 18.
(2) r = s


Need explanation please :
if the angle made in the circle are based on the circle points as vertex , is the angle double if it is made by one point was in the centre .
I can´t see the attached. However, if the central angle or the inscript angle is given in the drawing, you can find the radius and then the circumsference.
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