RRB Junior Engineer / DMS / CMA 2015 · Question 20 of 480

A ladder just reaches the top of a wall. The foot of the ladder is 8m away from the foot of the wall. The ladder makes an angle of 60° with the ground. The length of the ladder is

Mathematics - Trigonometry

Aa. 4m
Bb. 16mCorrect
Cc. m
Dd. 1 6^3 m 3

Answer: B. b. 16m

Explanation

Let AB is wall and SC is laddder which length x BC = x and AC = 8 In MCB, B cos 60°= — BC 1_= 8 2 x => x = 16 m

Source: Arihant RRB JE Solved Paper 26-Aug-2015 (3rd Shift), Q91–150 — published solved-paper compilation (Q1–90 technical not included in this source) · memory-based

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