Q: Why must walls be perpendicular?

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Yes. Take a look at the corner of your room, where two walls meet the floor.

If the walls in your house were not perpendicular they would probably topple over and you would no longer have a daily life for perpendicular lines to affect.

The quadrilaterals that have right angles must have a perpendicular line because that's where it meets.

Two perpendicular lines must cross at a 90 degree angle, like a plus sign: +

The walls of most buildings are perpendicular to the ground they are built on.

Related questions

Objects like walls, poles, and trees must be perpendicular to the ground if the ground is flat. This ensures that they are standing upright and stable on the level surface.

A perpendicular cat must be a cat

Yes. Take a look at the corner of your room, where two walls meet the floor.

If the walls in your house were not perpendicular they would probably topple over and you would no longer have a daily life for perpendicular lines to affect.

The quadrilaterals that have right angles must have a perpendicular line because that's where it meets.

Two perpendicular lines must cross at a 90 degree angle, like a plus sign: +

no they dont have to be perpendicular, just square,rectangle, and isoceles trapizoid

Not necessarily. But a parallelogram with perpendicular diagonals must always be one.

diagonals are perpendicular

The walls of most buildings are perpendicular to the ground they are built on.

The quadrilateral that must have diagonals that are congruent and perpendicular is the square. This is because its diagonals form a right angle at its center.

Perpendicular lines intersect at right angles. (90°) Therefore, by the definition of perpendicularity, two perpendicular lines must intersect.