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Byju's Answer
Standard VII
Mathematics
Pythagoras Theorem
The sides of ...
Question
The sides of certain triangles are given below. Determine which of them are right triangles.
(i) a = 7 cm, b = 24 cm and c = 25 cm
(ii) a = 9 cm, b = 16 cm and c = 18 cm
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Solution
(
i
)
We
know
that
in
a
right
-
angled
triangle
,
the
square
of
the
largest
side
is
equal
to
the
sum
of
the
squares
of
the
smaller
sides
.
Here
,
the
larger
side
is
c
,
which
is
25
cm
.
c
2
=
625
We
have
:
a
2
+
b
2
=
7
2
+
24
2
=
49
+
576
=
625
=
c
2
Thus
,
the
given
triangle
is
a
right
triangle
.
(
ii
)
We
know
that
in
a
right
-
angled
triangle
,
the
square
of
the
largest
side
is
equal
to
the
sum
of
the
squares
of
the
smaller
sides
.
Here
,
the
larger
side
is
c
,
which
is
18
cm
.
c
2
=
324
We
have
:
a
2
+
b
2
=
9
2
+
16
2
=
81
+
256
=
337
≠
c
2
Thus
,
the
given
triangle
is
not
a
right
triangle
.
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Similar questions
Q.
The sides of certain triangles are given below. Determine which of them are right triangles.
(i) a = 7 cm, b = 24 cm and c = 25 cm
(ii) a = 9 cm, b = 16 cm and c = 18 cm
(iii) a = 1.6 cm, b = 3.8 cm and c = 4 cm
(iv) a = 8 cm, b = 10 cm and c = 6 cm