Copy of Triangle Exterior Angle

In the app below, an exterior angle of a triangle is shown. The 2 colored angles are referred to as its remote interior angles.
Interact with this app for a few minutes. LARGE POINTS are moveable.
What can we conclude about the measure of an exterior angle when we compare it to its remote interior angles? Explain.
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What other theorem is readily made obvious here?
Font sizeFont size
Very smallSmallNormalBigVery big
Bold [ctrl+b]
Italic [ctrl+i]
Underline [ctrl+u]
Strike
Superscript
Subscript
Font color
Auto
Justify
Align left
Align right
Align center
• Unordered list
1. Ordered list
Link [ctrl+shift+2]
Quote [ctrl+shift+3]
[code]Code [ctrl+shift+4]
Insert table
Remove Format
Insert image [ctrl+shift+1]
Insert icons of GeoGebra tools
[bbcode]
Text tools
Insert Math
Close
– Ronan Downes, Tim Brzezinski

Information: Copy of Triangle Exterior Angle