Current location - Training Enrollment Network - Mathematics courses - What are the judgments about similar triangles in junior high school mathematics? Specifically, and their abbreviations.
What are the judgments about similar triangles in junior high school mathematics? Specifically, and their abbreviations.
Ad⊥bc of d,ce⊥ab
Therefore: ∠bad=90-∠b,
∠bce=90-∠b
So: ∠bad=∠bce
∠ ADB =∠ CDG = 90,
ab=cg
Therefore: △ Abd△ CGD
(aas)
So: AD = CD (congruent triangles has equal sides).