Parallel, intersecting or skew?
1 answer:
Two lines are:
- Parallel if they don't intersect and lie on the same plane
- Intersecting if...well, they intersect at one point
- Skew if they don't intersect and they lie on two different planes
So, we have:
- AB and BC intersect at point B
- AE and BF don't intersect, but both lie on the plane AEFB
- EF and AD don't intersect and don't lie on a common plane
- ABC and ABF intersect on segment AB
- AED and BFC are parallel (they're both perpendicular to plane ABC)
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14
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then you have to factor
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