question_answer

At what height does the tip of a 34m long ladder placed at a distance of 16 m from a wall, touch the wall?

A)  29 m                                    

B)  34 m

C)  30 m                                    

D)  18 m

Correct Answer: C

Solution :

    Let \[a+17(-d)=0\]m be the height at which the ladder touches the wall. According to Pythagoras' theorem, \[\Rightarrow \]\[{{t}_{18}}=0\]\[\text{9},\text{ 18},\text{ 27},\text{ }......\text{999}\]