That's elevation, not evolution!
Consider the fact that the sides of a 30-60-90 triangle are in the ratios
1:√3:2
and just scale that up for your diagram.
the angles of of evolution of the top of a hill from the City centres of two towns on either side of the hill are observed to be 30° and 60° respectively. if the distance of hill of the top from the city centre of first is 9 kilometre find in kilometres the distance uphill of the top from the other City Centre to the two places of decimal. ( use root 3 is equals to 1.73)
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