geometry - Triangle with all reflex angles? - Mathematics Stack

I was thinking about how a triangle could have all reflex angles. it would look like a regular triangle but the inside would be the outside and the outside would be the inside. Such a triangle would

curriculum in my Honors Geometry course MAT203 - Carmel Schettino

math - Concave and Convex Polygon - Turn arbitrary polygon into a convex polygon - Stack Overflow

Module 1 (M1) - Geometry & measures - properties of angles - BBC Bitesize

How to Find Circumcenter of a Triangle: 3 Simple Ways

How to Find Circumcenter of a Triangle: 3 Simple Ways

euclidean geometry - exterior angle of a reflex angle - Mathematics Stack Exchange

Acute, Obtuse and Reflex Angles - BSAK Year 4

How many types of triangles are there in geometry? What are they called (e.g., obtuse, scalene, equilateral)? - Quora

Learning angles Stock Vector Images - Alamy