A closed, convex, plane (2-dimensional) shape.
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It could be anything. Just because it has a triangle in it doesn't in any way determine its diameter.
It can be similar to each other with the base angles theorem. It would be 90 degrees and on the bottom would be both 45 degrees and if you would turn it sideways, there is your right triangle.
area of triangle 1 would be 16 and the other triangle is 9 as the ratio of areas of triangles is the square of their similar sides
A circle, square, oval, hemisphere, Equilateral triangle, Isosceles Triangle
If ll the angles of one triangle are the same as the angles of another triangle they are similar. Rotation is always allowed and mirroring often can be allowed.