A tetrahedron is a 3 dimensional shape bounded by 4 triangular faces. It has 4 vertices and six edges. Three faces meet at each vertex so that the shape is self-dual.
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three triangles rotating down left and up
Possibly triangles and rectangles.
the all 5 sides of pentagon are identical , so all the sides are equal to each other now D is the point which is the center of the pentagon , so the bisector drawns of the angles are equal to each other therefore all the sides of the penagon are equal which says that the equilateral triangles has all the sides equal therefore the triangles are equilateral triangles
two right triangles
They are Similar triangles if they have the same angles. it they are exactily the same they are Equaltrial.