What is the area of a square field whose diagonal of length 20 m? Select the correct option:
A) 150
B) 300
C) 200
D) 450
E) 600
Explanation:   d^2/2 = (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?