The length of bamboo pole is 1.5m, the shadow length is 1.2m, and the tangent of the angle between light and the ground is tanθ = 1.5/ 1.2 = 5/4.
The bamboo pole is 2m long, the shadow length is 1.6m, and the tangent tan θ of the angle between the light and the ground is 2/ 1.6 = 5/4.
The bamboo pole is 2.5m long, the shadow is 2m long, and the tangent tan θ of the included angle between the light and the ground is 2.2/2 = 5/4.
The shadow length of flagpole is 6.4M, and the shadow length of teaching building is 9.6M.
Flagpole length = 6.4×tanθ = 6.4×5/4 = 8m.
Height of teaching building = 9.6×tanθ = 9.6×5/4 = 12m.