This is circle based question from Chapter name- circles

Topic – Angle properties of circles

Chapter number- 15

In this question we have that a diameter AB and chord CD of a circle meet at P.

PT is a tangent to the circle at T.

Also some measures are given, CD = 7.8 cm, PD = 5 cm, PB = 4 cm.

Now we have to find (i) AB. (ii)the length of tangent PT.

ICSE Avichal publication

Understanding ICSE Mathematics

Question no 30(b)

(b) PT is tangent and PDC is secant out to the circle

∴ PT² = PC × PD