Draw △ ABC as an isosceles triangle with oblique two method, and find the area of the original triangle? BC=2

A simple method: the triangle of oblique dichotomy is two fourths of the area of the original triangle
It can be used directly~

Draw five points on the paper so that the triangle composed of any three points is an isosceles triangle. How should these five points be drawn? At least two

As shown in the figure, the five points of the first graph are the vertices of a regular pentagon; the positions of the four points in the second graph are the same as those of the first graph, and the position of point a is on the center of the circumscribed circle of the other four points

Draw five points on the paper so that the triangle composed of any three points is an isosceles triangle. How should these five points be drawn?

As shown in the figure, a, B, C, D, e five points

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