Asked by satishkumar
A surveyor wants to find the height of the top of a hill. He observes that the angles of elevation of the top of the hill at points C and D, 300m apart, lying on the base of the hill and on the same side of the hill are 30° and 45° respectively What is the height of the hill.
Answers
Answered by
Reiny
Let AB be the height of the mountain, where A is at the top and B is on the line containing C and D
let BD = x, and because of the 45° angle in the right-triangle ADB, AB = x
then by Pythagoras AD = √2 x
In triangle ACD , angle C 30, angle CDA = 135, leaving 15° for angle CAD
by the sine law
√2 x/sin30 = 300/sin15
x = 300 sin30/(√2 sin15)
= ...
you do the button pushing , (I got appr 409.8)
let BD = x, and because of the 45° angle in the right-triangle ADB, AB = x
then by Pythagoras AD = √2 x
In triangle ACD , angle C 30, angle CDA = 135, leaving 15° for angle CAD
by the sine law
√2 x/sin30 = 300/sin15
x = 300 sin30/(√2 sin15)
= ...
you do the button pushing , (I got appr 409.8)
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