G.1.21.2 Triangle Angle Sum One Way
Watch this video about the triangle sum theorem:
Rotate the green angle B 180 degrees about midpoint J. Rotate the pink angle C 180 degrees about midpoint K. What have you just proved? Explain how you know.
Rotate the green angle B 180 degrees about midpoint J. Rotate the pink angle C 180 degrees about midpoint K. What have you just proved? Explain how you know.