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From an external point P
MATHEMATICS · Single correct · CBSE · Mathematics · Circles · Circles
Problem
From an external point P, two tangents PA and PB are drawn to a circle with centre O. Which relation between the lengths PA and PB is always true? (a)
P
A
+
P
B
=
2
r
PA + PB = 2r
P
A
+
P
B
=
2
r
(b)
P
A
×
P
B
=
r
2
PA \times PB = r^{2}
P
A
×
P
B
=
r
2
(c)
P
A
=
P
B
PA = PB
P
A
=
P
B
(d)
P
A
>
P
B
PA > PB
P
A
>
P
B
Related theory
Circles
Tangent length properties
Number of tangents from a point
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