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Byju's Answer
Standard IX
Mathematics
SSS Criteria for Congruency
In the given ...
Question
In the given figure find area of triangle ECF.
△
E
B
C
=
480
s
q
.
c
m
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Solution
In figure parallelogram ABCD And BCEF line bc is a common base and BC II ADII EF
Then EF = BC and height both parallelogram is same
Then area of
△
E
C
F
=
1
2
E
F
×
h
i
e
g
h
t
Or area of
△
E
B
C
=
1
2
B
C
×
h
i
e
g
h
t
But height of
△
E
C
F
a
n
d
△
E
B
C
is equal and base BC=EF
Then area of both triangle is equal
Then area of
△
E
B
C
=
a
r
e
a
o
f
△
E
B
F
=480 sq cm
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Q.
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Find the area of the given parallelogram ABCD, if the area of the triangle EBC is 9 cm
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