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.
Penny Peterson. Penny Peterson is the tritagonist of the 2014 film, Mr. Peabody & Sherman. She is the daughter of Paul and Patty Peterson and is Sherman's arch-nemesis turned best friend and crush. She is voiced by Ariel Winter of Modern Family and Sofia the First.