Draw a line $l$. Draw a line parallel to line $l$ at a distance of $3.5 \mathrm{cm}$.

Draw $△ABC$ such that $l\left(BC\right)=5.5 \mathrm{cm}, m\angle ABC=90°, l\left(AB\right)=4 \mathrm{cm}$.

Show the orthocentre of the triangle.

Seg $AD$ and seg $BE$ are medians of $△ABC$ and point $G$ is the centroid. If $l\left(AG\right)=5 \mathrm{cm}$, find $l\left(GD\right).$

If $l\left(GE\right)=2 \mathrm{cm}$, find $l\left(BE\right)$.