7. From a spot 60' from the base of a building, Shanav measures the angle
of elevation to the top of the building
to be 48°, and the angle of elevation
to the top of an antenna on top of the
building to be 56º.
a) Find the height of the building.​

an

y = 6x -3y -12

y +3y +12 = 6x

=> . x = { 2y / 3 +2 } this is equation of line in terms of x

=> . if line meets the x-axis the co-ordinates of meeting point would be ( x , 0 )

=> . x = 2 ( 0 ) / 3 + 2

=> . x = 2

so, the point is ( 2 , 0 )

- (2, -7)

- lines r and s and lines t and u must be parallel