ABEAM
Perpendicular lines that that intersect at 90 degrees are right angles.
Two lines that intersect and form 90-degree angles (right angles) are "perpendicular" to each other. You would call them "perpendicular lines."
They meet at right angles
Perpendicular.
on the beam
ABEAM
An oblong is another term for a rectangle therefore it has four right angles.
Complimentary angles
Perpendicular lines that that intersect at 90 degrees are right angles.
The left of a ship is port and the right is starboard. Aft is the rear of a ship and the bow is the front of a ship.
Two lines that intersect and form 90-degree angles (right angles) are "perpendicular" to each other. You would call them "perpendicular lines."
Mutually Perpendicular
They meet at right angles
Perpendicular.
A parallelogram can have four equal sides that will not meet at right angles. The term diamond can also be used in this context.
Ship Ahoy! This is a term used whist indicating the ship either by gesture or by a heading.