A) \[20\,m\]
B) \[36\,m\]
C) \[18\,m\]
D) \[25\,m\]
Correct Answer: C
Solution :
Let KB is original height of the tree. In \[\Delta ABC,\] \[A{{C}^{2}}=A{{B}^{2}}+B{{C}^{2}}=52+122\] \[=25+144=169\] \[\therefore \] \[AC=\sqrt{169}=13\,m\] \[KB=KA+AB\] \[=(13+5)\,m=\,18m\] \[\therefore \] Original height of the tree is 18m.You need to login to perform this action.
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