Find the area of a rhombus whose side is 25 cm and one of the diagonals is 30 cm?	Choose the correct option:
A) 900 sq.cm.
B) 700 sq.cm.
C) 800 sq.cm.
D) 400 sq.cm.
E) 600 sq.cm.
Explanation:   Consider the rhombus ABCD. Let the diagonals intersect at E. Since diagonals bisect at right angles in a rhombus.   BE2 + AE2 = AB2   252 = 152 + AE2 AE = √(625 - 225)= 
<gadget id="calculator">(625 - 225)</gadget>
<output>400</output>
√400= 20,   AC = 20 + 20= 
<gadget id="calculator">20 + 20</gadget>
<output>40</output>
40 cm.   Area of a rhombus= 1/2 * d1d2   = 1/2 * 40 * 30= 
<gadget id="calculator">1/2 * 40 * 30</gadget>
<output>600</output>
600 sq.cm.   Answer: Option 600 sq.cm.
<result>E</result>
Find the area of a rhombus whose side is 25 cm and one of the diagonals is 30 cm?