What "CO" in COsine Means

[color=#000000]Take a few minutes to interact with the applet below.[br]Then, answer the questions that follow. [/color]
[color=#000000]In the right triangle above, what is the relationship between the [b][color=#1e84cc]blue angle[/color][/b] and [b][color=#ff00ff]pink angle[/color][/b]? [br](What vocabulary term/adjective describes the relationship between these 2 angles?) [/color]
[color=#000000]Fill in the blank with the correct word: [br][br]The _____________ of the [b][color=#1e84cc]blue angle[/color][/b] is the [b][color=#6aa84f]percentage displayed. [/color][/b][/color]
[color=#000000]Fill in the blank with the correct word: [br][br]The ___________________ of the [b][color=#ff00ff]pink angle[/color][/b] is the [b][color=#6aa84f]percentage displayed. [/color][/b][/color]
[color=#000000]Thus, we can conclude that if 2 angles are ______________________ (see your answer to (1)), then the __________ of [b][color=#1e84cc]one angle[/color][/b] is equal to the ____________________ of its [b][color=#ff00ff]___________________ [/color][/b]! [br][br]Notice how the first 2 letters of the last 2 blanks are the same? Why is this? [/color]
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– Tim Brzezinski

Information: What "CO" in COsine Means