Question

In a circle with centre P, chord AB is drawn of length 13 cm, seg PQ ⊥ chord AB, then find l(QB).

Answer 1

P is the centre of the circle.
AB = 13 cm
seg PQ ⊥ chord AB
Perpendicular drawn from the centre of the circle to the chord bisects the chord.
So, the length of QB = $\frac{1}{2}\mathrm{AB}=\frac{13}{2}=6.5$ cm.