What is the area of a square field whose diagonal of length 20 m?  Choose the correct option.
A) 287	B) 269	C) 270	D) 200	E) 230
d2/2 = (20 * 20)/2= 
<gadget id="calculator">(20 * 20)/2</gadget>
<output>200</output>
200   Answer:200
<result>D</result>
What is the area of a square field whose diagonal of length 20 m?