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Byju's Answer
Standard VII
Mathematics
Sum of the Lengths of 2 Sides of a Triangle
if each side ...
Question
if each side of a triangle is halved , then its perimeter will be decreased by what per cent ?
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Solution
Let
a
,
b
and
c
are
the
original
sides
of
the
∆
.
Now
,
perimeter
of
the
∆
,
P
=
a
+
b
+
c
.
When
each
of
the
sides
of
∆
is
halved
,
then
new
sides
are
:
a
'
=
a
2
;
b
'
=
b
2
;
c
'
=
c
2
New
perimeter
,
P
'
=
a
2
+
b
2
+
c
2
=
a
+
b
+
c
2
Decrease
in
perimeter
=
P
-
P
'
=
a
+
b
+
c
-
a
+
b
+
c
2
=
a
+
b
+
c
2
Decrease
%
=
decrease
original
perimeter
×
100
%
=
a
+
b
+
c
2
a
+
b
+
c
×
100
%
=
50
%
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Sum of the Lengths of 2 Sides of a Triangle
Standard VII Mathematics
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