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KEAM 2019 Math Paper
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© examsnet.com
Question : 39
Total: 121
The projections of a line on the axes are 3,4 , 5 . The length of the line is
7
50
49
16
√
50
Validate
Solution:
Given,
r
cos
α
=
3
,
r
cos
β
=
4
and
r
cos
γ
=
5
∴
r
2
(
cos
2
α
+
cos
2
β
+
cos
2
γ
)
=
9
+
16
+
25
r
=
√
50
© examsnet.com
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