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Help, i only need these few questions.

Help, i only need these few questions.-example-1
User BoomShadow
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Three dimensions, two intersecting planes.

20. AB ⊥ CD? There's a little perpendicularity indicator where they meet so YES

21. EF and CD meet at D. NO

22. D E and F are all on the same line. YES

23. G is in plane N but not plane M, B and E in plane M not N. Three noncollinear points determine a plane, here not M or N. YES

24. Two planes intersect in a line, here that's CD. YES

25. AB ⊥ N ? This is the interesting question. The plane N is formed by two lines, call them HG and HD. Both of those are perpendicular to AB. So every line in the plane N will be perpendicular to AB so plane N is perpendicular to AB. YES

User Chemicalkt
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