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`((sqrt3+1)/(sqrt3-1))hm``((sqrt3-1)/(sqrt3+1))h m``sqrt3hm``h/sqrt3m`

Answer :

A**Application of trignometry in real life.**

**Explain the angle of elevation & depression with the help of diagram.**

**A circus artist is climbing a 20 m long rope ; which is tightly stretched and tied from the top of a vertical pole to the ground . Find the height of the pole if the angle made by the rope with the ground level is `30^@`**

**From the top of the hill; the angle of depressions of two consecutive kilometre stones due east are found to be `30^@` and `45^@` . Find the height of the hill.**

**The shadow of a flag staff is 3 times as long as shadow of the flag-staff when the sunrays meet the ground at an angle of `60^@`. Find the angle between the sun rays and the ground at the time of longer shadow.**

**The angle of elevation of a cloud from a point 60m above a lake is `30^@` and the angle of depression of the reflection of cloud in the lake is `60^@`. Find the height of the cloud.**

**From the top of a building 15m high the angle of elevation of the top of tower is found to be `30^@`. From the bottom of same building ; the angle of elevation of the top of the tower is found to be `60^@`. Find the height of the tower and the distance between tower and building .**

**A man on a cliff observes a boat at an angle of depression of `30^@` which is approaching the shore to the point immediately beneath the observer with a uniform speed . Six minutes later ; the angle of depressions of the boat is found to be `60^@`. Find the time taken by boat to reach the shore.**

**The elevation of a tower at a Station A due north of it is `alpha` and at a station B due west of A is `beta`. Prove that the height of the tower is `(ABsinalphasinbeta)/sqrt(sin^alpha-sin^beta)`**