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The angle of elevation of a ladde reanin...

The angle of elevation of a ladde reaning against a wall is `45^(@)` and the foot of the ladder is 10 m away from the wall. The Iength of the ladder is :
A. 10`sqrt2` m
B. 13 m
C. 15 m
D. 16 m

A

A

B

B

C

C

D

D

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