6.1.3 Conditions for Parallelograms - Worksheet (continued)
Example 4: 8. A parallel rule can be used to plot a course on a navigation chart. The tool is made of two rulers connected at hinges to two congruent crossbars AD and BC. You place the edge of one ruler on your desired course and then move the second ruler over the compass rose on the chart to read the bearing for your course. If AD || BC, why is AB always parallel to CD ?
D
C
A
B
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