As shown in the figure, in △ ABC, angle c = 90 °, de ⊥ AB and D, intersection AC and E, if BC = BD, AC = 4cm, BC = 3cm, ab = 5cm, calculate △ ad Find the perimeter of the triangle ade,

As shown in the figure, in △ ABC, angle c = 90 °, de ⊥ AB and D, intersection AC and E, if BC = BD, AC = 4cm, BC = 3cm, ab = 5cm, calculate △ ad Find the perimeter of the triangle ade,

Study on △ ade and △ ACB
Because ∠ ade = ∠ ACB = 90 ° and there is a common angle ∠ a, so
And AD and AC are similar edges
Each side length of △ ACB
AB = 5, BC = 3, then AC = 4, perimeter is 12
Because BD = BC = 3
So the perimeter of △ ade = △ ACB perimeter * similar edge ratio AD / AC
= 12*2/4=6