Given that ABCD is a rectangle, ab = a, ad = B, PA ⊥ plane ABC, PA = C, then the distance from P to BC is? And the distance from P to BD is?

The distance from P to BC is Pb
Do AE ⊥ BD through a, find AE, and then the distance from P to BD is PE
It's probably called the three perpendicular theorem
You can also build a space rectangular coordinate system

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