<iframe scrolling="no" title="Tổng các góc trong tam giác" src="https://www.geogebra.org/material/iframe/id/ffgkwz8b/width/1857/height/1480/border/888888/sfsb/true/smb/false/stb/false/stbh/false/ai/false/asb/false/sri/false/rc/false/ld/false/sdz/false/ctl/false" width="1857px" height="680px" style="border:0px;"> </iframe> ====================== <iframe style="border: 0px;" title="cắt góc tam giác" src="https://www.geogebra.org/material/iframe/id/vzgmhrjm/width/1862/height/734/border/888888/sfsb/true/smb/false/stb/false/stbh/false/ai/false/asb/false/sri/false/rc/false/ld/false/sdz/false/ctl/false" width="1862px" height="534px" scrolling="no"> </iframe>
