In a rectangular coordinate system, what is the area of a rhombus whose vertices have the coordinates (0, 3.5), (11, 0), (0, -3.5), (-11, 0)?  Choose the correct answer.
A) 56 B) 77 C) 112 D) 116 E) 120
Area of rhombus= 1/2* D1 *D2   Length of 1st diagonal = 11+11= 
<gadget id="calculator">11+11</gadget>
<output>22</output>
22   Length of 2nd diagonal= 3.5+3.5= 
<gadget id="calculator">3.5+3.5</gadget>
<output>7</output>
7   Area= 1/2*22*7= 
<gadget id="calculator">1/2*22*7</gadget>
<output>77</output>
77   77 is the answer
<result>B</result>
In a rectangular coordinate system, what is the area of a rhombus whose vertices have the coordinates (0, 3.5), (11, 0), (0, -3.5), (-11, 0)?