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Omni-MATH / Let ABCD be an isosceles trapezoid with AD=BC=255 and AB=128. Let M be the midpoint of CD and let N be the foot of the perpendicular from A to CD. If ∠MBC=90^(∘), compute tan∠NBM.

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problem

Let ABCDA B C D be an isosceles trapezoid with AD=BC=255A D=B C=255 and AB=128A B=128. Let MM be the midpoint of CDC D and let NN be the foot of the perpendicular from AA to CDC D. If ∠MBC=90∘\angle M B C=90^{\circ}, compute tan∠NBM\tan \angle N B M.
Plain-text mathematical notation (without MathML)
Let ABCD be an isosceles trapezoid with AD=BC=255 and AB=128. Let M be the midpoint of CD and let N be the foot of the perpendicular from A to CD. If ∠MBC=90^(∘), compute tan∠NBM.
Original LaTeX notation
Let $A B C D$ be an isosceles trapezoid with $A D=B C=255$ and $A B=128$. Let $M$ be the midpoint of $C D$ and let $N$ be the foot of the perpendicular from $A$ to $C D$. If $\angle M B C=90^{\circ}$, compute $\tan \angle N B M$.

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