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  • Solve this problem A ladder 40m long rests against a wall. If the feet of the ladder is 20m from the wall, then the angle of elevation is

A ladder 40m long rests against a wall. If the feet of the ladder is 20m from the wall, then the angle of elevation is 

  • Option 1)

    30^{\circ}

  • Option 2)

    45^{\circ}

  • Option 3)

    60^{\circ}

  • Option 4)

    90^{\circ}

 

Answers (1)

best_answer

As we discussed in concept

Trigonometric Ratios of Functions -

\sin \Theta = \frac{Opp}{Hyp}

\cos \Theta = \frac{Base}{Hyp}

\tan \Theta = \frac{Opp}{Base}

- wherein

Trigonometric Ratios of Functions

 

 Cos\theta =\: \frac{20}{40}= \frac{1}{2}

\therefore \theta = \: 60^{\circ}


Option 1)

30^{\circ}

This option is incorrect.

Option 2)

45^{\circ}

This option is incorrect.

Option 3)

60^{\circ}

This option is correct.

Option 4)

90^{\circ}

This option is incorrect.

Posted by

divya.saini

View full answer

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