Teacher2Teacher Q&A #286

Teachers' Lounge Discussion: Teaching conversion of units of measurement

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From: Loyd

To: Teacher2Teacher Public Discussion
Date: 2004092813:43:13
Subject: Re: converting minutes into thousand/tenths

On 2004092809:14:07, Feliciano Gonzales wrote: > >I was wondering if there was a way to convert an angle of 2 minutes >into thousands of an inch or tenths of an inch? > You have to specify a radius length and then you can specify the arc length. Formula is Arc Length = theta x radius. Theta is the angle and the formula as stated, requires radian measure. The angle is 2 minutes (2/60 degrees) which in radian measure = (2/60)xPi/180=.000581776 radians. You can find this formula in most any physics or trig book. Just look up arc length or look up definition of a radian. A radian is defined as an angle at the center of a circle whose subtended arc is the length of the radius of the circle. So, once you have a radius in inches, find the arc length and then convert to thousands or tenths of an inch.

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