Your answer would be b i'm pretty sure
That is a 30 60 90 triangle.
Read about those here: http://www.1728.org/trig2.htm
If each person got 1/6 then there is still 2/6 left over, =1/3. In fraction strips, we would do
1
1/3 1/3 1/3 1/3
1/6 1/6 1/6 1/6 1/6 1/6 for the overall tomato and then 1/6 1/6 for the remaining piece of the tomato.
Hope this helps, if you need any more help just comment :)
Area=basexhigh so, Area= 6x3 , so answer will be 18