The Sum of the Angles of a Triangle
|
Use the two sliders to move copies of the two angles B and C next to to angle A to fill the semi-circle marking the 180 degree straight angle atop the triangle. |
|
|
Exterior Angle of a Triangle
|
Use the two sliders to move copies of the two angles α and β to fill the exterior angle Θ at angle γ. |
|
|