Discussion

Explanation:

Join OR as shown.

m ∠ORP = m ∠OPR = a  …(OP = OR; ∆ORP is isosceles)

Similarly, m ∠ORQ = m ∠OQR = b  …(OQ = OR, ∆ORQ is isosceles)

m ∠PRQ = a + b

Now, m ∠PRQ × 2 = m ∠POQ

∴ m ∠PRQ = 25°

∴ a + b = 25°

Hence, option (c).

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