Draw two parallel lines at a distance $5 \mathrm{cm}$ apart.

Draw a triangle $ABC$ with $AB=6 \mathrm{cm}, BC=7 \mathrm{cm}$ and $CA=8 \mathrm{cm}$. Using ruler and compass alone, draw the bisector $AD$ of $\angle A$.

Draw a triangle $ABC$ with $AB=6 \mathrm{cm}, BC=7 \mathrm{cm}$ and $CA=8 \mathrm{cm}$. Using ruler and compass alone, draw perpendicular $AL$ from $A$ on $BC$. Measure $\angle LAD$.