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Do you understand the diagram? @kryton1212

yes

i know PR is the diameter. But how to explain

What's the value of all the angles of a rectangle?

90

We know that angle PQR is 90, don't we?

yes

ohhh. angle in semicircle?

Yeah :)

Do you understand it ?

I understand now. Would you help me with another question?

Sure, but post it as a different question