SOHCAHTOASOHCAHTOA recalls right-triangle ratios: Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent. Use a chosen acute angle, between 0° and 90°.
You’ll leave with these skills
01Read sine and cosine from a point on the unit circleRead the point’s x-value as the cosine and its y-value as the sine.
02Convert between degrees and radiansMultiply a degree measure by π/180 to convert it to radians. Multiply a radian measure by 180/π to convert it to degrees.
03Find the exact sine and cosine of 30, 45, and 60 degreesUse the 30-60-90 and 45-45-90 triangles with a hypotenuse of 1 to get the exact coordinates of those points on the unit circle.
04Find the sine and cosine of angles past 90 degreesMeasure the angle to the nearest side of the x-axis to get the sizes of the coordinates, then use the point’s quadrant to decide which ones are negative.
This lesson is part of the full library
207 lessons that teach every skill the SAT tests
71Math
40Reading
24Grammar
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