Question

Amber defined perpendicular lines as lines in a plane that intersect. Is Ambers definition valid?

Answer 1

No, her definition is not valid. Perpendicular lines are two lines that cross at 90 degree angles (aka "right angles"). Amber is technically correct in saying that the lines do cross, but there's more to the story.

Answer 2

No, her definition is not valid.

Explanation:

Amber defined perpendicular lines as lines in a plane that intersect.

No, her definition is not valid.

The correct definition of perpendicular lines is :

A line meeting another line at a right angle or 90° is said to be perpendicular to it.

So, her definition should have been : perpendicular lines are those lines in a plane that intersect at right angles.