Question

Find the missing die length

Answer 1

$\cos(60) = \frac{ \sqrt{3} }{u} \\ \frac{1}{2} = \frac{ \sqrt{3} }{u} \\ u = 2 \sqrt{3}$
${v}^{2} + 3 = {u}^{2} \\ {v}^{2} + 3 = 12 \\ v = 3$