It is the inclination of a keel perpendicular to waterline.
Can you keel down
The base word of perpendicular is "perpend."
perpendicular
keel
perpendicular
In Latin, carina is a word for boat, or the keel of a boat.
The hexagon haded 6 perpendicular lines.
A flag pole is perpendicular to the ground.
The keel of the boat is made of lead and weighs 600 lbs. Even though customers can make me feel upset sometimes, I try to keep an even keel when dealing with them. That boat will not be able to sail in such shallow water because of its large keel. Sailboats with a mast of any appreciable size need a keel to remain stable. I am so tired, I feel like I could keel over at any moment.
No, a pentagon is not perpendicular. The word perpendicular describes two lines (or line segments) that meet at a 90o angle.
parallel