A 10 m long ladder is placed against a wall. It is inclined at an

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51.

A 10 m long ladder is placed against a wall. It is inclined at an angle of 30° at the ground. The distance (in m) of the foot of the ladder from the wall is left parenthesis Given space square root of 3 space equals space 1.732 right parenthesis 

  • 7.32

  • 8.66

  • 8.16

  • 8.26


B.

8.66


Let the distance of the ladder from the wall be x m.
Here, AC (ladder) = 10 m
Now, 
cos space 30 degree space equals space straight B over straight H space equals space straight x over 10
straight x space equals space 10 space cos space 30 degree space equals space 10 space cross times space fraction numerator square root of 3 over denominator 2 end fraction space equals space 5 square root of 3 space equals space 5 space cross times space 1.732 space equals space 8.66 space straight m


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52.

A ship after sailing 12 km towards South from a particular place covered 5 km more towards East. Then, the straightway distance of the ship from that place is

  • 11 km

  • 18 km

  • 13 km

  • 15 km


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