- Herman Vanderkooy
Angles ABC and DBC are called Supplementary Angles. Move point C to change angles ABC and DBC. What do you notice about these two angles?
Angles DAC and BAC are called Complementary Angles. Move Point C to change the angles DAC and BAC. What do you notice about these two angles?
Move point C to create a different angle. What do you notice about the two angles which are measured?