Angles of a TriangleDegrees, Radians, and PiProve Triangle Angles Add to 180°How to Use a ProtractorDrawing and Labeling TrianglesCongruent TrianglesSimilar TrianglesTrigonometry BasicsPythagorean TheoremSquares and Square RootsPythagoras’ LEGO BricksSine, Cosine, TangentHypotenuse ModelComplementary AnglesOther RatiosAngles Greater Than 90°Finding the Length of a SideArcsin, Arccos, ArctanCalculating with Sine and CosineMeasure Something BigTesting with a Known ObjectGarage Roof HeightChapter Key PointsTerminology and SymbolsReferencesAnswersHypotenuse ModelCalculating with Sine and Cosine