Inscribed Equilateral Triangle in a Circle - Geometry Diagram #133318 (License: Personal Use)

This minimalist black-and-white illustration depicts an equilateral triangle whose three vertices lie exactly on the circumference of a circle, forming a classic case of a cyclic triangle. The diagram highlights fundamental geometric properties such as equal side lengths, 60° internal angles, and the relationship between the circumradius and triangle side length. It is commonly used to teach circle theorems, trigonometry, and Euclidean constructions.

Used in educational web pages, math textbooks, and online tutorials covering plane geometry, circle theorems, or polygon-circumcircle relationships; serves users seeking visual aids for proofs or conceptual understanding.