NELDC Trigonometry
Massachusetts Curriculum Framework · Grades 4–12
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45°
cos θ
(across)
sin θ
(up)
tan θ
(sin ÷ cos)
📐 SOH CAH TOA
Right triangles
SOH
— sin θ = opposite ÷ hypotenuse
CAH
— cos θ = adjacent ÷ hypotenuse
TOA
— tan θ = opposite ÷ adjacent
⭐ Special angles
Worth memorizing
0°
30°
45°
60°
90°
radians
0
π/6
π/4
π/3
π/2
sin
0
1/2
√2/2
√3/2
1
cos
1
√3/2
√2/2
1/2
0
tan
0
√3/3
1
√3
—
Grade
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Problems
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NELDC Trigonometry Workbook · Massachusetts Curriculum Framework
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