Question

at a particular time on a
day flagstaff 5m high casts a
Shadow of length 4.5 m
what is the length of the shadow
of a hole of a hight 1 m at the same moment ?
​

Answer 1

Answer:

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Answer 2

Given :- At a particular time on a day , a flagstaff 5 m high casts a. shadow of length 4.5 m . What is the length of the shadow of a pole of height 1 m at the same time. ?

Solution :-

in right ∆ABC, we have,

→ ∠ACB = θ

→ AB = flagstaff = 5m

→ BC = shadow = 4.5m .

so,

→ tan θ = AB / BC

→ tan θ = 5 / 4.5

→ tan θ = 50/45

→ tan θ = 10/9

now, in right ∆DEF, we have,

→ ∠DFE = θ (since time is same.)

→ DE = Pole = 1m

→ EF = shadow = ? .

so,

→ tan θ = DE / EF

putting value of tan θ,

→ (10/9) = 1 / EF

→ 10EF = 9

→ EF = (9/10)

→ EF = 0.9 m . (Ans.)

Hence, Length of shadow of pole at the same time is 0.9 m.

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