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Byju's Answer
Standard X
Mathematics
Calculating Heights and Distances
If 3cos A= ...
Question
If
3
cos
A
=
4
sin
A
, the value of
cos
A
is
m
5
, m is
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Solution
3
cos
A
=
4
sin
A
tan
A
=
3
4
tan
A
=
P
B
=
3
4
P
=
3
,
B
=
4
By Pythagoras Theorem,
H
2
=
P
2
+
B
2
H
2
=
3
2
+
4
2
H
2
=
9
+
16
H
=
5
cos
A
=
B
H
=
4
5
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