Two circle touch each externally at point P. Q is a point on the common tangent through P. Then, the tangents QA and QB are equal.
True
Given - Two circle with centre O and O' touches at P externally. Q is a point on the common tnagent through P. QA and QB are tangents from Q to the circle respectively.
To Prove - QA = QB.
Proof - From Q, QA and QP are the tangents to the circle with centre O.
∴ QA = QP .....(i)
Similarly, QP and QB are the tangens to the circle with centre O'
∴ QP = QB .....(ii)
From (i) and (ii)
QA = QB Q.E.D