A newly-planted tree needs to be staked with three wires. Each wire is attached to the trunk 3 ft. above the ground, and then an
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5 x 0.4 = 2 and 
= 1.4142....... which is an irrational number
Using pythagoras theorem,
a^2 + b^2 =c^2
11^2 + 11^2 = c^2
c^2=242
c=
c= 15.556
c=15.6