Corresponding medians of two similar triangles measure 11 cm and 8 cm.
Find the ratio of their areas.

A median is a corresponding length, so the sides are also in the ratio 11 : 8. Area ratio = ${\left(\frac{11}{8}\right)}^2=\frac{121}{64}$, i.e. 121 : 64. The option 11 : 8 forgets to square, 64 : 121 puts the triangles the wrong way round, and 1331 : 512 cubes instead.