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vertically opposite angles

Author:
qubiqmedia
Topic:
Angles, Geometry
In this worksheet another pair of lines intersect.
One of the angles is labelled correctly, but somehow the other angle sizes have been hidden. What is the size of the other orange angle? Why? What is the size of the blue angle at the top? What about the blue angle at the bottom? How did you figure this out? Is there another way to figure this out using a different rule?

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