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In this video I show how you can use compasses and a ruler to construct triangles' inscribed and circumscribed circles. You may want to watch my video about geometric construction with compasses and a ruler before watching this video - use the link below: • Geometric construction (with compasses &... In the video I use the so-called Hagoromo Luminous Color Chalk. The chalk is produced by the South Korean company Sejongmall (https://en.sejongmall.co.kr/) 0:00 Title 0:10 Introduction 0:26 Inscribed circle 3:38 Circumscribed circle 7:20 Closing comments 7:56 A few words about Hagoromo chalk