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January 28, 2015

January 28, 2015

Posted by **Camile** on Tuesday, May 17, 2011 at 8:49pm.

Lines AB and LM are each perpendicular to plane P. Are AB and LM coplanar?

Plan P is perpendicular to AB at B. Plane Q intersects AB at P. Can Q be perpendicular to AB?

- Math -
**Reiny**, Tuesday, May 17, 2011 at 9:02pmfirst part:

Suppose you are standing a ruler on the floor, the ruler is RS, and it is perpendicular to the floor.

If T is not along this ruler, could RT be parallel to ruler RS ??? (NO)

2nd:

think of a table with 4 legs.

All the legs would be perpendicular to the table and parallel to each other. Could you imagine a plane containing two of the legs? (YES)

I don't follow the wording of the 3rd question

- Math -
**Camile**, Tuesday, May 17, 2011 at 9:04pmI wrote the question wrong. its supposed to be

Plan P is perpendicular to AB at B. Plane Q intersects AB at B. Can Q be perpendicular to AB?

- Math -
**Reiny**, Tuesday, May 17, 2011 at 9:12pmdepends on your definition of "intersects"

Imagine a wall and the floor, the wall being Q and the floor being P. They would be perpendicular.

Along the wall draw a line AB, with B on the floor and AB perpendicular with the floor.

Does the wall "intersect" the line AB at B, that is, is B on he wall?

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