In triangle PQR, cos (p+r) = 0. What is m angleQ equal to ?
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cos(p+r)=cos 90. (cos 90=0)
p+r=90
p+q+r=180. (sum of measure of all the interior angles of a triangle is equal to 180)
q=180-(p+r)
q=180-90
q=90
p+r=90
p+q+r=180. (sum of measure of all the interior angles of a triangle is equal to 180)
q=180-(p+r)
q=180-90
q=90
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