Opposite Angles
What do you think is true about the angles across from each other in the diagram below? Move the points to change the angles.
Click "show angle measurements".
We can see that opposite angles (angles across from each other when two lines cross)
have no relationship
add up to 180[math]^\circ[/math]
are equal
add up to 90[math]^\circ[/math][br]
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Information: Opposite Angles