A family wants to buy an awning for a French window that will be long enough
to keep out the sun when it is at its highest
point in the sky. The height of the French
window is 2.80 m. The angle of elevation
of the sun from this point to the bottom of
the window is 70°. The awning will be 90°
to the window. Find how long the awning
should be. Write down your answer correct
to 2 dp.