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Mathematics · 2022 · 3 marks
CBSE 2022 · Region 1 · Set 1 · Q9
The angle of elevation of the top of a building from the foot of the tower is $\displaystyle 30$° and the angle of elevation of the top of the tower from the foot of the building is $\displaystyle 60$°. If the tower is $\displaystyle 50$ m high, then find the height of the building.From a point on a bridge across a river, the angles of depression of the banks on opposite sides of the river are $\displaystyle 30^{\circ}$ and $\displaystyle 45^{\circ}$ respectively. If the bridge is at a height of $\displaystyle 3$ m from the banks, then find the width of the river.
The angle of elevation of the top of a building from the foot of the tower is $\displaystyle 30$° and the angle of elevation of the top of the tower from the foot of the building is $\displaystyle 60$°. If the tower is $\displaystyle 50$ m high, then find the height of the building.
From a point on a bridge across a river, the angles of depression of the banks on opposite sides of the river are $\displaystyle 30^{\circ}$ and $\displaystyle 45^{\circ}$ respectively. If the bridge is at a height of $\displaystyle 3$ m from the banks, then find the width of the river.
Marking-scheme solution
9. No marks to be deducted for the cumulative effect of an error. It should be penalized only once
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CBSE Class 10 Mathematics past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.