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.
He is known for his work on the animated TV series SpongeBob SquarePants, on which he has long-running-roles as Sheldon Plankton, Larry the Lobster, Elaine and various other characters including Artist at Sea. He was the voice of Edward T. Platypus, Nurse Leslie, Dave, and Ping-Pong on Camp Lazlo. Lawrence also performed the voice of Filburt in Rocko's Modern Life and is recently the voice of the Announcer and Manant in The Aquabats! Super Show!. Lawrence is a standup comedian, cartoonist, writer-director, animator and producer on the television series Johnny Talk.