In a rectangular coordinate system, what is the area of a rectangle whose vertices have the coordinates (-8, 1), (1, 1), (1, -7 and (-8, -7)?
Choose the most appropriate option
A) 144  B) 36  C) 72  D) 56  E) 112
Length of side 1= 8+1= 
<gadget id="calculator">8+1</gadget>
<output>9</output>
9   Length of side 2= 7+1= 
<gadget id="calculator">7+1</gadget>
<output>8</output>
8   Area of rectangle= 9*8= 
<gadget id="calculator">9*8</gadget>
<output>72</output>
72   72 is the answer
<result>C</result>
In a rectangular coordinate system, what is the area of a rectangle whose vertices have the coordinates (-8, 1), (1, 1), (1, -7 and (-8, -7)?