A triangle with VERY round points is a circle.
There is no geometric term for a triangle with rounded points, but a triangle with rounded sides is known as a Reuleaux triangle. It is similar to the shape used for the piston in a rotary engine.
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A triangle, but only if the line segments are straight.
right triangle
triangular polygon
The term 'equilateral' means having equal sides. For example, an equilateral triangle is a triangle with 3 sides all of equal length.
The abbreviation for triangle is "tri." In geometry, the term "tri" is commonly used to represent a triangle in equations, diagrams, and proofs. It is derived from the prefix "tri-" which means three, reflecting the three sides of a triangle.