Donald wants to sell his property and hence decides to measure it. He calls upon a surveyor, to do the job. The property is in the shape of an isosceles triangle. The surveyor measures one side as 8 miles side long. The area of the property is 40 square miles. How far is it from the middle of the 8 miles side of the property to the intersection of the other two sides ?

Question

$\begin{array}{1 1} (a)\;8\;miles \\ (b)\;10\;miles \\ (c)\;12\;miles\\(d)\;15 miles\end{array} $