The Unit CircleTrig beyond right triangles, and the sign pattern in each quadrant.10th GradeOn a circle of radius 1 centred at the origin, a point atangle θ has coordinates (cos θ, sin θ).(cos θ, sin θ)Quadrant Iboth positiveAll ratios positive.Quadrant IIsin positivex is negative, so cos is negative.Quadrant IIItan positiveBoth x and y negative, so their ratio is positive.Quadrant IVcos positivey is negative, so sin is negative.ASTC: All, Sine, Tangent, Cosine positive, going anticlockwise fromquadrant I.The Unit Circlelearnposters.com
The Unit Circle — printable math wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the The Unit Circle poster

The rule, 4 worked examples.

ASTC: All, Sine, Tangent, Cosine positive, going anticlockwise from quadrant I.

Questions about the The Unit Circle poster

What’s on the The Unit Circle poster?
The rule, 4 worked examples. On a circle of radius 1 centred at the origin, a point at angle θ has coordinates (co…; (cos θ, sin θ); Quadrant I = both positive; Quadrant II = sin positive; Quadrant III = tan positive; Quadrant IV = cos positive. ASTC: All, Sine, Tangent, Cosine positive, going anticlockwise from quadrant I.
Who is the The Unit Circle poster for?
The Unit Circle is filed under 10th Grade (ages 15–16), so it matches what that year asks a child to remember. It is equally useful to an older student revisiting math, and to the parent or teacher answering the question at the kitchen table.
When should you use the The Unit Circle poster?
The x-coordinate is cosine, the y-coordinate is sine. That single fact carries everything. A wall chart earns its place by being glanceable from where the work is happening, so The Unit Circle belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
What other posters go with The Unit Circle?
SOH-CAH-TOA, Sequences and Series and Circle Theorems sit alongside The Unit Circle in the 10th Grade set. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.SOH-CAH-TOASequences and SeriesCircle Theorems
Is the The Unit Circle poster free to download and print?
Yes. The Unit Circle downloads as a free PDF with no account, no email and no watermark, like everything else in the 10th Grade set. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the The Unit Circle poster print at?
The Unit Circle is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of The Unit Circle loses nothing.Printing guide

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