LON-CAPA geo_rTri001.problem

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$\textrm{In a right-triangle } ABC \textrm{,} \angle A = 90^{\circ} \textrm{, and} \angle C = 30^{\circ} \textrm{. If } M \textrm{ is} \\ \textrm{the midpoint of } BC \textrm{, and } AM = 21 \textrm{ cm, determine } AB \textrm{.}$

$AB = 21 \ \textrm{cm}$

$AB = 7\ \textrm{cm}$

$AB = 63\ \textrm{cm}$

$AB = 42\ \textrm{cm}$

$AB = \frac{21}{2}\ \textrm{cm}$

$\textrm{None of the above}$

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