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If we draw a triangle, we can say that the 15 foot ladder is the hypotenuse. The angle f 48 degrees with the ground means that it is the angle of elevation, therefore, to find the height of the building, you may use the formula sin 48=x/15

sin 48=\frac{x}{15}
15 sin 48=x
x=11.15 foot

The height of the wall is 11.15 foot. Hope this helps =)
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