But AD = AGcosθ (see the figure) and AG = L/2 and θ = 70°. This implies, .(Where L=4 m and cos70° = 0.342). Now consider the diagram. BC is the perpendicular in ΔABC and therefore, BC = ABsin70°. But AB = L = 4 m and sin70°= 0.939. Thus, BC = 4 × 0.939 = 3.756 m. Looking at the diagram, BC = AE, so put the values of AD, W and AE in equation (3),
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