CBSE Class 10 Answered
trigonometry
Asked by | 11 Mar, 2009, 08:09: PM
Expert Answer
BC is the wall, at C there is a window, CD is the pole pointing upwards
To find length CD.
Solution:
1) In triangle ABC tan 300 =BC/AB
1/
AB =103m
2) In triangle ABC
(AB)2 +(BC)2 =(AC)2
(103)2 +(10)2 =(AC)2
400=(AC)2
20 =AC
3) In triangle ACD tan30o =CD/AC
1/3 =CD/20
CD =20/3
CD =11.5m
Therefore the rod is 11.5m long
Answered by | 06 Jul, 2009, 11:35: AM
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