Each side of a certain parallelogram has length 5. If the area of the parallelogram is 20. Which of the following is the measure of one of its angles? Pick:
A) 30 B) 45 C) 53.13 D) 90 E) 120
area of a parallelogram = b*h   b*h=20   h=20/5= 
<gadget id="calculator">20/5</gadget>
<output>4</output>
4   sin theta=opp/hyp= 4/5   theta = sin inv of 4/5=53.13 deg   53.13
<result>C</result>
Each side of a certain parallelogram has length 5. If the area of the parallelogram is 20. Which of the following is the measure of one of its angles?