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Byju's Answer
Standard X
Mathematics
Pythagoras Theorem
ABC ∼ DEF.If ...
Question
ABC
~
DEF.
If
A
(
△
ABC
)
:
A
(
△
DEF
)
=
16
:
25
and
BC
=
2
.
2
cm
,
find
EF
.
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Solution
Since
△
ABC
~
△
DEF
,
A
(
△
ABC
)
A
(
△
DEF
)
=
AB
2
DE
2
=
BC
2
EF
2
=
AC
2
DF
2
⇒
A
(
△
ABC
)
A
(
△
DEF
)
=
BC
2
EF
2
On
substituting
A
(
△
ABC
)
A
(
△
DEF
)
=
16
25
,
BC
=
2
.
2
cm
,
we
get
:
16
25
=
(
2
.
2
)
2
EF
2
⇒
EF
2
=
25
16
×
2
.
2
2
⇒
EF
2
=
5
4
×
2
.
2
2
On
taking
square
root
of
both
sides
,
we
get
:
EF
=
5
4
×
2
.
2
=
2
.
75
cm
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