What is the area of a square field whose diagonal of length 28 m?  Choices:
A) 288
B) 289
C) 200
D) 112
E) 392
d2/2 = (28 * 28)/2= 
<gadget id="calculator">(28 * 28)/2</gadget>
<output>392</output>
392   Answer: 392
<result>E</result>
What is the area of a square field whose diagonal of length 28 m?