Using a Ladder to Reach the Top of A $12-\mathrm{m}$ Tall Building, the Ladder Must Not Exceed an Angle Of Tall

Short Answer

Using a ladder to reach the top of a $12-\mathrm{m}$ tall building, the ladder must not exceed an angle of $65^{\circ}$ with the ground to be safe. How far from the base of the building must the foot of the ladder be in order to be safe?