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Byju's Answer
Standard X
Mathematics
Basic Proportionality Theorem
In ΔABC, AC =...
Question
In
Δ
A
B
C
, AC = 15 cm and DE || BC. If
A
B
A
D
=
3
, then the length of EC is :
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Solution
Given: DE
∥
BC
From basic proportionality theorem;
A
D
D
B
=
A
E
E
C
Now,
A
B
A
D
=
A
D
+
D
B
A
D
=
1
+
D
B
A
D
⇒
1
+
D
B
A
D
=
3
⇒
D
B
A
D
=
2
⇒
A
D
D
B
=
A
E
E
C
=
1
2
⇒
2
A
E
=
E
C
⇒
A
C
=
A
E
+
E
C
−
−
−
−
−
−
−
(
1
)
On substituting value of EC in (1), we get
15
=
3
A
E
⇒
5
=
A
E
⇒
E
C
=
10
c
m
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