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Math problems in the second volume of the ninth grade! ! Urgent! ! ! ! ! !
Solution: ∫ab is the diameter, CD⊥AB is the unit p,

∴ arc AC= arc AD, CD=2CP.

∴∠ACD=∠CBA

ACB =∠ armored personnel carrier

∴△ACP∽△CBP

∴AP:CP=CP:BP

Namely CP? =AP*BP=2* 10=20

Then CP=2√5 (cm)

∴CD=2CP=4√5 cm

I hope it helps you.

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