Let there be a triangle A B C with A D being a line passing through A intersecting B C (not extended) at D and B E being the line passing through B and intersecting A C (not extended) at E let the intersection of A D and B E be H .
If the area of Δ A H E be 2 , the area of Δ A H B be 3 and the area of Δ B H D be 4 . Find the area of C D H E .
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i have solved in the same way.
Do you mean that point "H" instead of point "F" ?.
Please, do that in your problem as a correction.
Isn't H = F ? Great problem though!
Confused how did X suddenly come ??????
I will use the property that in the given quadrilateral
[
∆
A
E
H
]
[
∆
B
H
D
]
=
[
∆
E
H
D
]
[
∆
A
H
B
]
Where [∆ABC] denotes Area of ∆ABC.
Plugging in the values, we get
[
∆
E
H
D
]
=
3
8
.
Note that triangles on collinear bases with equal altitudes have their areas proportional to the lengths of their bases, as stated by SHARKY sir.
So,
D
B
C
D
=
[
∆
E
D
B
]
[
∆
E
D
C
]
=
[
∆
A
D
B
]
[
∆
A
C
D
]
.
Again plugging in the values we get area of ∆ECD=93.33.
So area of CEHD= 96
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I will write a general solution for when the area of Δ A H E is a , the area of Δ A H B is b and the area of Δ B H D is c .
Note that triangles on collinear bases with equal altitudes have their areas proportional to the lengths of their bases.
By this above property, we have that H B E H = b a and H D A H = c b . Draw line C H and let the areas of Δ C H E and Δ C H D be d and e respectively. Notice that Δ C A H and C H D have collinear bases and have equal altitude. Thus, H E B H = d a + e . Similarly, H D A H = c + e d . Thus, we have the following:
c b b a = c + e d = d a + e
Solving the simultaneous linear equations in terms of d and e , we get d = b 2 − a c a c ( a + b ) and e = b 2 − a c a c ( b + c ) , so the area of C D H E = d + e = b 2 − a c a c ( a + 2 b + c ) . Substituting the values from the question is, we get the answer of 96. Thus, the answer is 96.