2021-2022 school year liwan Eighth grade first semester math final question

As shown in the figure, two triangles with common vertices △ABC, △AB ‘C’, if AB=AB ‘, AC=AC ‘and ∠BAC+∠B’ AC ‘=180°, we say △ABC and △AB’ C ‘are complementary triangles to each other.(1) As shown in the figure, △ABC is an isosceles triangle, △ABE and △ACD are isosceles right triangles, which are connected with DE;Verify:… Read more 2021-2022 school year liwan Eighth grade first semester math final question