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Transcript
```Parallel and Perpendicular Lines
LESSON 3-3
Suppose that the top and bottom pieces of a picture frame are
cut to make 60° angles with the exterior sides of the frame. At what
angle should the two sides be cut to ensure that opposite sides of the
frame will be parallel?
In order for the opposite sides of the frame to be parallel,
same-side interior angles must be supplementary.
Two 90° angles are supplementary, so find an adjacent angle that,
together with 60°, will form a 90° angle: 90° – 60° = 30°.
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GEOMETRY
Parallel and Perpendicular Lines
LESSON 3-3