Abeam
ABEAM
Perpendicular lines that that intersect at 90 degrees are right angles.
They meet at right angles
Perpendicular.
Two lines that intersect and form 90-degree angles (right angles) are "perpendicular" to each other. You would call them "perpendicular lines."
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.
They meet at right angles
Perpendicular.
Mutually Perpendicular
Two lines that intersect and form 90-degree angles (right angles) are "perpendicular" to each other. You would call them "perpendicular lines."
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.