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11-73.

In the figure at right, . Is ? Justify your answer using a flowchart.

Line segments, A,C, & B,D, intersect at E, with line segment from A, to B, with angles D,A,B, & C,B,A, each a right angle.

Make a drawing on paper and mark the four congruent segments.

Both triangles, although they overlap each other, have right angles, and they share a side .
Review the Math Notes box in section 7.1.7.

is an isosceles triangle, which makes .
Consider which triangle congruence condition can be met.