# The angle of elev

In the fig AB is the Chimney and CD is the tower of 40m

In ∆AED

tan 60° =

√3 =

h = √3DE ……………..(1)

In ∆DEB

tan 30° =

=

DE = 40√3 ………………..(2)

On substituting value of DE from

eqn (2) in eqn (2), we get

h = √3 × 40√3 = 120

Therefore height of Chimney is 40 + 120 = 160m

Yes, the height of the chimney meets the pollution norms.

Chimneys are made tall so that smoke should go high in the atmosphere in order to minimize air pollution.

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