Answer :

Let AB and CD be a tower and a pole respectively

And, the shadow of BE and DF be the shadow of AB and CD respectively

**To find: AB**

At the same time, the light rays from the sun will fall on the tower and the pole at the same angle

Therefore,

**∠DCF = ∠BAE**

And,

**∠DFC = ∠BEA**

∠CDF = ∠ABE (Tower and pole are vertical to the ground)

**ΔABE ****ΔCDF** (AAA similarity)

Hence, By the properties of similar triangles that if two triangles are similar, their corresponding sides will be proportional.

AB = 42 m

Height of the Tower = 42 m

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