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Measurement of arch


 
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sanjib
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PostPosted: Fri Jul 03, 2009 6:56 am    Post subject: Measurement of arch 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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PostPosted: Fri Jul 03, 2009 11:42 am    Post subject: Re: Measurement of arch 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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