In a rectangular coordinate system, what is the area of a rhombus whose vertices have the coordinates (0, 3.5), (10, 0), (0, -3.5), (-10, 0)? Choose the correct choice from the following options
A) 56  B) 88  C) 70  D) 116  E) 120
Area of rhombus= 1/2* D1 *D2   Length of 1st diagonal = 10+10= 
<gadget id="calculator">10+10</gadget>
<output>20</output>
20   Length of 2nd diagonal= 3.5+3.5= 
<gadget id="calculator">3.5+3.5</gadget>
<output>7</output>
7   Area= 1/2*20*7= 
<gadget id="calculator">1/2*20*7</gadget>
<output>70</output>
70   70 is the answer
<result>C</result>
In a rectangular coordinate system, what is the area of a rhombus whose vertices have the coordinates (0, 3.5), (10, 0), (0, -3.5), (-10, 0)?