Area of obtuse angled triangle – GeoGebra
4.1.1: Angles and Triangles - Mathematics LibreTexts
Measuring and Drawing Angles with GeoGebra - MathsLinks
Simple Angles Review – GeoGebra
Part Two Acute, Obtuse, and Right Angles
Obtuse Angle – GeoGebra
Between an Angle – GeoGebra
Types of angles - the 5 classifications – GeoGebra
S-Obtuse angle – GeoGebra