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The height of a tree is measured by means of a cross-staff as shown in the figure above. The horizontal bar \(DE\) is

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The height of a tree is measured by means of a cross-staff as shown in the figure above. The horizontal bar \(DE\) is

by Gmat_mission » Sun Jan 31, 2021 2:43 pm

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The height of a tree is measured by means of a cross-staff as shown in the figure above. The horizontal bar \(DE\) is adjusted up or down until points \(D, F,\) and \(B\) are in a straight line. Measured on level ground, \(DE\) is \(1\frac12\) feet, \(EF\) is \(12\) feet, \(GE\) is \(5\) feet and \(GA\) is \(60\) feet. How tall is the tree?


A. \(20\frac12\, ft.\)

B. \(22\, ft.\)

C. \(24\, ft.\)

D. \(25\frac12\, ft\).

E. \(26\frac12\, ft.\)


Answer: D

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