When you buy a coffee table or piece of circular furniture
S/4-6.8=-9.8
S/4= -9.8+6.8
S/4= -3
S=-3*4
S= -12
X = half width of tent
Tan(40) = 6/x
x = 6/Tan(40) = 7.15
2x = 14.30 feet the width of the tent
It is given in the question that

And 
can also be written as

Therefore,


That gives,
