[size=150]Construct a triangle with two 60-degree angles. Use[b][i] A[/i][/b] and [b][i]B[/i] [/b]as points when using the ANGLE WITH GIVEN SIZE tool [icon]/images/ggb/toolbar/mode_anglefixed.png[/icon]. [/size]
Use the ANGLE tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_angle.png[/icon] to measure this triangle's third angle. What is it? Does this result surprise you? Why should this third angle measure what it does? [br]
[br][br]8. Use the DISTANCE or LENGTH tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_distance.png[/icon] to measure the lengths of the 3 sides of this triangle. Then select the MOVE tool [icon]/images/ggb/toolbar/mode_move.png[/icon] to move the vertices of this triangle around. What do you notice about any triangle that's equiangular?