The diagonal of a square is 40 m. The area of the square is:
Select:
A) 600
B) 900
C) 800
D) 500
E) 400
Arear = 1/2 × ( diagonal )(power)2   = ( 1/2 × 40 × 40 )m(power)2   = 1600/2= 
<gadget id="calculator">1600/2</gadget>
<output>800</output>
800 m(power)2   Answer is 800.
<result>C</result>
The diagonal of a square is 40 m. The area of the square is: