Find the area of a rhombus whose side is 25 cm and one of the diagonals is 31 cm?
Choose the correct choice from the following answers.
A) 276 sq.cm	B) 268 sq.cm	C) 618 sq.cm	D) 297 sq.cm	E) 620 sq.cm
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 * 31= 
<gadget id="calculator">1/2 * 40 * 31</gadget>
<output>620</output>
620 sq.cm.   Answer:620 sq.cm
<result>E</result>
Find the area of a rhombus whose side is 25 cm and one of the diagonals is 31 cm?