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Mathematics
Problem
The angle of intersection of circles
x
2
+
y
2
+
8
x
−
2
y
−
9
=
0
x^2 + y^2 + 8x - 2y - 9 = 0
x
2
+
y
2
+
8
x
−
2
y
−
9
=
0
&
x
2
+
y
2
−
2
x
+
8
y
−
7
=
0
x^2 + y^2 - 2x + 8y - 7 = 0
x
2
+
y
2
−
2
x
+
8
y
−
7
=
0
is- (1)
60
∘
60^\circ
6
0
∘
(2)
90
∘
90^\circ
9
0
∘
(3)
45
∘
45^\circ
4
5
∘
(4)
30
∘
30^\circ
3
0
∘
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