document.write( "Question 404376: if i have angles in the circle... how do i figure them out if i kno the arcs?
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Algebra.Com's Answer #285818 by scott8148(6628)\"\" \"About 
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central angles (vertex at the center of the circle) are equal to their encompassed arc\r
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\n" ); document.write( "\n" ); document.write( "vertical angles (lines intersecting in a circle) are equal to the average of the encompassed arcs\r
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\n" ); document.write( "\n" ); document.write( "a special case of the vertical angle is when the vertex is on the circumference of the circle
\n" ); document.write( "___ in this case ; one of the encompassed arcs is zero
\n" ); document.write( "___ the measure of the angle is still the average of the arcs ; but the average is half of the remaining arc
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