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Senior high school mathematics compulsory 2 planes
Let the intersection of AC be l 1 as shown in the figure; The intersection of BC is l2.

Take a little p on plane c? Exceeded p, PM⊥l 1? Then PM? ⊥ Face a change? (The conclusion is that the plane is vertical, perpendicular to the intersection of the ⊥ plane) What about PM? ⊥L (perpendicular to the plane means perpendicular to any straight line)

Can you also prove it by PN? ⊥L

Because l is perpendicular to the two intersecting lines on plane c? L is perpendicular to plane C.

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