what is the height of the post
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Answer:
Let AB be the vertical post its shadow is 21m when the altitude of the sun is 30
o
BC=21m,∠ACB=30
o
,AB=h metres (figure)
ABC is rt. △,
BC
AB
=tan30
o
⇒
21
h
=
3
1
⇒ h=
3
21
=
3
7×
3
×
3
=7
3
m
⇒ AB=h, Height of the pole =7
3
m
Explanation:
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