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For two items (Planes, lines, line segments, ect.) to be perpendicular that means that they meet at a 90 degree angle. Perpendicularity is denoted by the ⊥ symbol. For example line AB ⊥ line CD would mean that the line AB would be perpendicular to the line CD.

Q: What does it mean for something to be perpendicular?

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two lines that intersect at 90 degrees are perpendicular ex +

Graphs in math books

It has no right angles, so if that is what you mean, no, it is not.

If you mean: y = 4x+2 then the line perpendicular to it will have a slope of -1/4

If you mean: 2x-3y = 8 then y = 2/3x-8/3 and the perpendicular slope is -3/2

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Perpendicular means that two lines intersect like an X but its just perpendicular

In Physics, "normal" force means force that's perpendicular to something, usually to a surface.In that usage, 'normal' does not mean ordinary, typical, usual, familiar, etc.

two lines that intersect at 90 degrees are perpendicular ex +

It means "at right angles to" or "perpendicular to" something else.

Perpendicular lines are two lines that intersect to form four right angles.

If you mean y = -13x then the slope of the line perpendicular to it is 1/13

Graphs in math books

The sides on a ladder are perpindicular from each other.

It has no right angles, so if that is what you mean, no, it is not.

It is the symbol for 'perpendicular'.

If you mean: y = -4x+3 then the perpendicular slope is 1/4

In geometric terms, one line is said to be perpendicular to another when their angle of intersection is 90°