4. Isosceles Triangle with a Perpendicular Bisector Congruent side markings Perpendicular angle markings A B C D
5. Isosceles Triangle with a Perpendicular Bisector Congruent side markings Perpendicular angle markings What else do we know? A B C D
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9. Isosceles Triangle with a Perpendicular Bisector If the two triangles are congruent, what else do we know? A B C D
10. Isosceles Triangle with a Perpendicular Bisector If the two triangles are congruent, what else do we know? <A = <C <BAD = <CAD All of its parts, angles and sides are congruent! A B C D
11. Isosceles Triangle with a Perpendicular Bisector A B C D You’ve used geometric reasoning to figure out more information about Δ ABC and its bisector !