Side Side Side
Triangle DEF has been constructed in such a way that segments DE and EF are always congruent to AB and BC, respectively.
Move vertices around until AC is congruent to DF. What else do you notice?
MT1-08-P2a-XT1 Rectangular Prism Dimensions and Surface Area
Steffen's area of a trapezoid
Suma na vnatresni agli na triagolnik
Partial Linear Relations
Some properties of a regular 13-gon
Incircle or Inscribed Circle