A topic you 'somewhat know' is a topic you don't know yet. Be honest about your weak areas.

SOF IMO · Free quiz

SOF IMO — free 10-question quiz

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Question 1 of 10

Easy

Two chords AB and CD of a circle intersect at point P inside the circle. If AP = 6 cm, PB = 4 cm and CP = 3 cm, find the length of PD.