Acute Angles – GeoGebra

Reduction to acute angle of trigonometric functions – GeoGebra

Learn Angles - GeoGebra Math Resources

Different types of angles – GeoGebra

Finding Acute Angles of Right Triangles – GeoGebra

Table 2 from Fostering Students' Development of the Concept of Angles Using Technology.

Creating acute angle in Geogebra.

Examining An Acute Angle – GeoGebra

Right Triangles: Identifying Sides WRT Acute Angles – GeoGebra

The Related Acute Angle – GeoGebra

4.1.1: Angles and Triangles - Mathematics LibreTexts

Learn Angles - GeoGebra Math Resources

Examining An Acute Angle – GeoGebra

Estimating acute and reflex angles. – GeoGebra