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Byju's Answer
Standard IX
Mathematics
Radius
If the length...
Question
If the length of the chord
Y
Z
is equal to the radius of the circle
O
Y
, find
∠
Y
X
Z
A
60
∘
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B
30
∘
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C
80
∘
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D
100
∘
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Solution
The correct option is
B
30
∘
R.E.F image
As
O
Y
=
Y
Z
=
O
Z
(given)
⇒
O
Y
Z
is an equilateral
Δ
∴
ϕ
=
60
∘
As angle subtended by a chord at center is twice the angle
subtended at any other pt. on circumference
⇒
ϕ
=
2
θ
⇒
θ
=
30
∘
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