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Thursday, April 14, 2011

HW: pg456 #19-39 odds (lesson 9-2)- read the instructions! Show the work when finding the LENGTH of each arc.

Today: lesson 9-2 more in depth. We worked on finding the measure of an arc and the LENGTH of an arc. Two separate types of measurement.

Measure of an arc is equivalent to the measure of its central angle.
The length of an arc is a fraction of its CIRCUMFERENCE.
Length of an arc = (x/360) *(C) = (x/360)*(pi*d)
where x = measure the arc's central angle.

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