What is the area of a square field whose diagonal of length 20 m?
Choices:  A) 338  B) 377  C) 200  D) 887  E) 1771
d2/2 = (20 * 20)/2= 
<gadget id="calculator">(20 * 20)/2</gadget>
<output>200</output>
200   Answer:200
<result>C</result>
What is the area of a square field whose diagonal of length 20 m?