Diagonals

A diagonal of a rhombus is 20 cm long. If it's one side is 26 cm find the length of the other diagonal.

Correct result:

u =  48 cm

Solution:

$$\begin{gathered} a=26 \\ v=20 \\ {a}^2=(u\mathrm{/}2{)}^2+(v\mathrm{/}2{)}^2 \\ u=2\cdot \sqrt{a^2-(v\mathrm{/}2{)}^2}=2\cdot \sqrt{26^2-(20\mathrm{/}2{)}^2}=48\text{ cm} \end{gathered}$$

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