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Standard VI
Mathematics
Formation of Algebraic Expressions
The base of a...
Question
The base of a triangular field is three times its height. If the cost of cultivating the field is
R
s
1080
per hectare. If the total cost of cultivating the field is
R
s
14580
. find its base and height.
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Solution
Given
Let ABC be a triangle and CD is
⊥
to AB.
Given AB = 3CD---(1)
cost of cultivating per hectare = 1080
Total cost in cultivating field ABC = 14580 Rs
So area of field ABC
=
14580
1080
hectare
area of field ABC
=
13.5
hectare
or
135000
m
2
Now we know
area of triangle
=
1
2
(
A
B
×
C
D
)
using eq(1) we get
1
2
×
3
C
D
×
C
D
=
135000
(
C
D
)
2
=
270000
3
=
90000
C
D
=
300
m
and
A
B
=
900
m
Hence height of field is
=
300
m
and Base of field is
=
900
m
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