2 lines passing through each other making exactly four 90 degree angles
Ramanujuan
perpendicular
Is most needed in activities that requires a lot of inquisitive thinking like reading mathemathical theories and scientific formula
Mutually Perpendicular
Lines that intersect each other at right angles are called perpendicular lines
Perpendicular lines are two lines that intersect to form four right angles.
In geometric terms, one line is said to be perpendicular to another when their angle of intersection is 90°
It is the orthocentre.
There are multiple meanings for the word "perp". Colloquially, in the United States and other countries, the term refers to a perpetrator or criminal. The term can also mean perpendicular.
The lines are perpendicular.
Circumcenter
It is difficult without more context but I am guessing that it refers to Perpendicular Height.