Two buildings - angles of elevation

What is the height difference between the buildings?

79m 35m 56m 76m

What is the angle of elevation to the nearest degree?

23[math]^\circ[/math] 34[math]^\circ[/math] 76[math]^\circ[/math][br] 54[math]^\circ[/math]

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Informacja: Two buildings - angles of elevation