In mathematical induction, showing that something works for the first case, or that P1 is true. angle of depression. The angle formed by a horizontal line and an observer's line of sight to an object below. angle of elevation. The angle formed by a horizontal line and an observer's line of sight to an object above.
Plankton's voice is provided by American actor Mr. Lawrence. The voice Lawrence uses for Plankton originated as an imitation of one of his deep-voiced friends from high school. On television, he first used the voice for incidental characters on Rocko's Modern Life.
Sheldon J. Plankton (born November 30, 1942; age 74) is Mr. Krabs' arch-nemesis and the main antagonist in the SpongeBob SquarePants television series as well as The SpongeBob SquarePants Movie. He is also the largest protagonist villain, although in some episodes that mainly focus on him, he is not portrayed as an antagonist/villain.