In the isosceles triangle $DEF$, $\angle E=\angle F=35°$ and side $EF=10 \mathrm{m}$.
Calculate the perpendicular distance from $D$ to $EF$.

        

In the isosceles triangle $DEF$, $\angle E=\angle F=35°$ and side $EF=10 \mathrm{m}$.

Calculate the length of the side $DE$.

The diagram shows a regular pentagon with side $2 \mathrm{cm}$. $O$ is the centre of the pentagon.
Find angle $AOE$.

The diagram shows a regular pentagon with side $2 \mathrm{cm}$. $O$ is the centre of the pentagon.
Find angle $AOM$.

   

The diagram shows a regular pentagon with side $2 \mathrm{cm}$. $O$ is the centre of the pentagon.

Use trigonometry on triangle $AOM$ to find the length $OM$.

The diagram shows a regular pentagon with side $2 \mathrm{cm}$. $O$ is the centre of pentagon.

Find the area of triangle $AOM$