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The right angle is symbolized by a small square, and its measure, 90°, is written to the right and above it. The angle placed to the right of the 90° angle is shown as an arc, and its measure, 30°, is written to the left of the arc. The angle above the right angle is also represented by an arc, and its measure, 60°, is written below said arc.
File:Bad drawing of a 30-60-90 triangle.svg. SVG development . The SVG code is . This trigonometry was created with a text editor. Licensing. Public ...
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The 30°–60°–90° triangle is the only right triangle whose angles are in an arithmetic progression. The proof of this fact is simple and follows on from the fact that if α , α + δ , α + 2 δ are the angles in the progression then the sum of the angles 3 α + 3 δ = 180°.