Triangle Types in Trigonometry: Which Ones Work for Basic Trig? #295633 (License: Personal Use)

The image displays three triangle types: a pink scalene triangle (marked with a red 'X'), a purple equilateral triangle (also marked with a red 'X'), and a green right-angled triangle (approved with a green checkmark). A yellow banner emphasizes that basic trigonometry applies exclusively to right-angled triangles, where side ratios define sine, cosine, and tangent functions.

Used in educational web pages, math tutorials, or e-learning platforms teaching foundational trigonometry; matches user intent to understand triangle classification and trigonometric applicability.