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Byju's Answer
Standard IX
Mathematics
Basics of Geometry
why in a righ...
Question
why in a right triangle breadth / height is cos theta ?
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Q.
A right angled triangle has perimeter of length
7
and hypotenuse of length
3
. If
θ
is the largest non-right angle in the triangle, then the value of
cos
θ
equals
Q.
Assertion :In a right angled triangle,
sin
47
o
=
cos
43
o
Reason:
sin
θ
=
cos
(
90
+
θ
)
, where
θ
is an angle in the right angled triangle.
Q.
Assertion :In a right angled triangle, if
cos
θ
=
1
2
a
n
d
sin
θ
=
√
3
2
, then
tan
θ
=
√
3
Reason:
tan
θ
=
sin
θ
cos
θ
Q.
In
△
A
B
C
prove that if
θ
be any angle, then
b
cos
θ
=
c
cos
(
A
−
θ
)
+
a
cos
(
C
+
θ
)
.
Q.
Area of a triangle whose vertices are
(
a
cos
θ
,
b
sin
θ
)
,
(
−
a
sin
θ
,
b
cos
θ
)
and
(
−
a
sin
θ
,
−
b
cos
θ
)
is
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