Question

from a point A i observe that the angle of elevation of the top of the tree is 21 degree i walk 10m toward the foot of the tree to obtain B from where the angle of elevation of the top of the tree is 34 degree,calculate the height of the tree above the level of the observation
500
the height is 50km
50 km? That's some tall tree. Did you draw a diagram? If so, it should be clear that the height h is found using
h cot21° - h cot34° = 10
h = 10/(cot21° - cot34°) = 8.9 m

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