One of two tangents from an external point given: the other tangent

The same question, asked 2 times: 17 Sep 2025 S1, 18 Sep 2025 S2. Every wording below, oldest first.

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Question 1
17 Sep 2025 S1
73 $From an outside point P, two tangents, PA and PB, are drawn to a circle. Given that the length of PA is 12 cm, what is the length of PB?$
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Question 2
18 Sep 2025 S2
74 $From a point outside a circle, two tangents are drawn to the circle. If one of the tangents measures 12 cm, what is the length of the other tangent?$
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