Question 824278
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use similar right triangles:
from top of Alice's head to the building, and
from base of building to Alice's feet along the ground
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tanA = opp/adj
tanA = 1.2/12
A = arctan( 1.2/12 )
A = 5.710593137499643 degrees
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use right triangle from top of Alice's head to the building, then up to the top of the building:
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B = 41 - 5.710593137499643
B = 35.289406862500357 degrees
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tanB = opp/adj
tanB = opp/12
opp = 12*tanB
opp = 12*tan(35.289406862500357)
opp = 8.493143180846317 m
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answer:
building height = opp + 1.2
building height = 8.493143180846317 + 1.2
building height = 9.693143180846317
building height = 9.7 m
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