Question 1149637
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When the instructions are followed, BC and CD are congruent, and CDE and CBA are both right angles.<br>
When you can sight A directly over C, angles ACB and EDC are congruent.<br>
Then triangles ABC and EDC are congruent by angle-side-angle.<br>
AB and DE are corresponding parts of those congruent triangles.<br>
So the width of the stream AB, is the same as the length of DE.<br>