What is the area of a square field whose diagonal of length 20 m?	Choose the correct choice from the following options:
A) 228
B) 271
C) 200
D) 277
E) 181
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?