9000124503

A tall radio mast is attached by several cables. The length of each cable is $30\mathrm{m}$ and all cables are attached $2\mathrm{m}$ under the top of the mast. The second end of the cable is anchored to the ground. The cable is in the height $6\mathrm{m}$ if measured directly above the point which is in the distance $8\mathrm{m}$ from the point where the cable is anchored to the ground. Find the height of the mast.