What’s on the The Special Triangles poster
The rule, 4 worked examples.
- The 45-45-90 and 30-60-90 triangles have fixed side ratios, giving exact trig values…
- 45-45-90 → 1 : 1 : √2 · 30-60-90 → 1 : √3 : 2
- 45-45-90 = 1 : 1 : √2
- 30-60-90 = 1 : √3 : 2
- sin 30° = 1/2
- tan 45° = 1
The shortest side always faces the smallest angle. That check catches most ratio mix-ups.
Questions about the The Special Triangles poster
- What’s on the The Special Triangles poster?
- The rule, 4 worked examples. The 45-45-90 and 30-60-90 triangles have fixed side ratios, giving exact trig values…; 45-45-90 → 1 : 1 : √2 · 30-60-90 → 1 : √3 : 2; 45-45-90 = 1 : 1 : √2; 30-60-90 = 1 : √3 : 2; sin 30° = 1/2; tan 45° = 1. The shortest side always faces the smallest angle. That check catches most ratio mix-ups.
- Who is the The Special Triangles poster for?
- The Special Triangles 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 Special Triangles poster?
- Sketch both from scratch. Deriving them beats memorising them. A wall chart earns its place by being glanceable from where the work is happening, so The Special Triangles belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
- What other posters go with The Special Triangles?
- Sequences and Series, Circle Theorems and Completing the Square sit alongside The Special Triangles 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.Sequences and SeriesCircle TheoremsCompleting the Square
- Is the The Special Triangles poster free to download and print?
- Yes. The Special Triangles 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 Special Triangles poster print at?
- The Special Triangles 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 Special Triangles loses nothing.Printing guide
Related posters
Charts that sit alongside The Special Triangles on the same wall.
Browse every 10th Grade poster, or start from the full catalogue.