1.

When the sun is 30^@ above the horizon, shadow of one tree is 17.3 m long What is the height of this tree ?

Answer»

20 m
17.30 m
10 m
1.73 m

Solution :From trigonometry TAN `30^@="height of free AB"/"BC"`
`therefore` Height of tree , `AB= tan 30^@ BC=1/sqrt3xx17.3`
=10 cm


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