Midpoints

Triangle ABC with sides a = 5 cm, b = 3 cm, c = 40mm has a midpoint of K, L, M. How many centimeters is long perimeter of parallelogram KBLM?

Correct result:

x =  9 cm

Solution:

$$\begin{gathered} a=5 \\ b=3 \\ c=40\mathrm{/}10=4 \\ {a}^2=b^2+c^2 \\ x=a\mathrm{/}2+c\mathrm{/}2+a\mathrm{/}2+c\mathrm{/}2=5\mathrm{/}2+4\mathrm{/}2+5\mathrm{/}2+4\mathrm{/}2=9\text{ cm} \end{gathered}$$

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