## Detailed description

Two diagrams.

- Left triangle ABC with interior angle A marked α, B marked β, C mark γ. Dotted lines and arrows pointing to foldings.
- Right straight line with angles α, β and γ meeting at a point on the line.

Two diagrams.

- Left triangle ABC with interior angle A marked α, B marked β, C mark γ. Dotted lines and arrows pointing to foldings.
- Right straight line with angles α, β and γ meeting at a point on the line.