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Sin0
0
Sin30
1/2
Sin45
sqrt(2) / 2
Sin60
sqrt(3) / 2
Sin90
1
Cos0
1
Cos30
sqrt(3) / 2
Cos45
sqrt(2) / 2
Cos60
1 / 2
Cos90
0
Tan0
0
Tan30
1 / sqrt(3)
Tan45
1
Tan60
sqrt(3)
Tan90
X
Interior angles
180 (n - 2)
Sum of exterior angles
360
Cosine rule
Cos A = (b² + c² - a²) / 2bc
Area of a triangle
½ a b sin(C)
Inequalities: line NOT included
Dotted line
Inequalities: line included
Solid line
Area shaded in?
Not needed
If in doubt, substitute values to see if shaded or not