10th Class Mathematics Solved Paper - Mathematics-2016 Outside Delhi Set-I

  • question_answer A ladder, leaning against a wall/makes an angle of \[60{}^\circ \] with the horizontal. If the foot of the ladder is 2.5 m away from the wall, find the length of the ladder.

    Answer:

    Let AB be the ladder leaning against a wall AC.
    Then,                            \[\cos \,60{}^\circ =\frac{BC}{AB}\]
                                        \[\frac{1}{2}=\frac{2.5}{AB}\]
                                        \[AB=2.5\times 2=5\,m\]
    \[\therefore \] Length of ladder is \[5\text{ }m\].


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