Angles of a triangle

Angles of a triangle

One of the first things we learn about triangle geometry, is the sum of its angles, 180^o. This app demonstrates why is it so. Move the slider(s) to see.

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<iframe fullscreen="" height="500px" scrolling="no" src="https://www.geogebra.org/material/iframe/id/dghje9zb/width/500/height/500/border/000000/rc/false/ai/false/sdz/false/smb/false/stb/false/stbh/false/ld/false/sri/false" style="border: 0px;" width="500px"> </iframe>

Central angle and inscribed angle

Central angle and inscribed angle of a circle

Can you find out what is the relationship between central angle and inscribed angle of a circle.

<Show embed code>

<iframe fullscreen="" height="350px" scrolling="no" src="https://www.geogebra.org/material/iframe/id/yvwan9mc/width/350/height/350/border/000000/rc/false/ai/false/sdz/false/smb/false/stb/false/stbh/false/ld/false/sri/false" style="border: 0px;" width="350px"> </iframe>