# What does perpendicular look like?

Perpendicular is when two lines cross and form a right angle, which I hope you know what that is.

### How can you tell when two lines are perpendicular?

If you measure the angle between them and it's exactly 90 degrees, then they're perpendicular. That's the definition and the requirement. Perpendicular lines form a "corner", but if you want to be technical about it, that's not a good way to tell. The angle might be only 87 degrees, or it might be 92 degrees, and when you look at it, it may look like a corner. But technically, if it's not 90 degrees then…

### What is a polyhedron with two parallel congruent bases and other faces being parallelograms?

It is a prismoid - a prism-like solid whose lateral faces are not perpendicular to the bases. It is a prismoid - a prism-like solid whose lateral faces are not perpendicular to the bases. It is a prismoid - a prism-like solid whose lateral faces are not perpendicular to the bases. It is a prismoid - a prism-like solid whose lateral faces are not perpendicular to the bases.

### What does perpendicular mean mathematicaly?

Perpendicular is mostly used to describe Shapes and their properties. It means when two lines meet up at a 90 degrees right angle. It might be an X or a T when you look at it. Like the example shown below: ------------------------------------ l l l l l So that isn't a good drawing, but it does show you the meaning of perpendicular!