[填空题]
A flagpole stands at th7*l3dmvhbul8;z0ysn e top of a building. The angle of elh fo2okp m7mf+4:6uydevation from a point on the ground 40m from the base of the building to hofom4ud f2mp+ yk67:the bottom of the flagpole is $29^{\circ}$, and to the top of the flagpole is $31^{\circ}$.
1.Draw a diagram representing the situation.
2.Find the length of the flagpole. m
