Discussion

Explanation:

CP = PD = 30/2 = 15 cm

EP = PF = 24/2 = 12 cm

∴ CE = FD = 15 – 12 = 3 cm

In ∆OPC, R2 = OP2 + PC2   …(1)

In ∆OPF, r2 = OP2 + PF2   …(2)

(1) - (2)

R2 – r2 = 152 - 122 = 225 – 144 = 81   …(3)

Now, in ∆OAQ

AO2 = AQ2 + OQ2 

⇒ AQ2 = AO2 – OQ2

AQ2 = R2 – r2 = 81

⇒ AQ = 9

⇒ AB = 2 × 9 = 18

Hence, option (a).

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