When x = 19
Gagan’s marks in Mathematics = 19
And marks in English = 45 – 19 = 26
When x = 24
Gagan’s marks in Mathematics = 24
And marks in English = 45 – 24 = 21
Q. 27. From a point 100 m above a lake, the angle of elevation of a stationary helicopter is 30° and the angle of depression of reflection of thehelicopter in the lake is 60°. Find the height of the helicopter.
Sol.
Let A be the
stationary helicopter
and F be the reflection
of the helicopter, CB be
the level of lake and D
be the point 100 m
above it
Let AB = height of
helicopter = x m
then BF = x m
BE = DC = 100 m
Let DE = BC = y m
AE = AB – EB = (x – 100) m
and EF = BF + EB = (x + 100) m
| Mathematics 2008 Question Papers Class X | |||||||
| Delhi | Outside Delhi | Compartment Delhi | Compartment Outside Delhi | ||||
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Set 2 | ||||
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Set 3 | |
Set 3 | ||||
