Construcción de triangulos

https://www.youtube.com/watch?v=_wXCb_UexSM

https://www.youtube.com/watch?v=QdG0g-wfaLM

https://www.youtube.com/watch?v=cBErmWozwDE

https://www.youtube.com/watch?v=RleoGeiFWJU&t=1s

https://www.youtube.com/watch?v=tSDHLArPwvA&t=5s

https://www.youtube.com/watch?v=Yjjk9iQ8IrE

https://www.youtube.com/watch?v=H94EHdtHAKY

https://www.youtube.com/watch?v=-Ru8jq6Bjjc