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Posted by Tori on Sunday, May 22, 2011 at 10:17pm.
In Rights Triangle ABC with C=90 degrees if a=4 and c=2square roots of 7, find SinA
sinA = a/c = 4 / 2sqrt7 = 2 / sqrt7, Multiply numerator and denominator by sqrt of 7: sinA = 2sqrt7 / 7.
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