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A triangle is a 2D object, and faces can only be found on 3D objects.But yes, the bottom line of a triangle is still a side, and the bottom face of a 3D object with a triangular face is still a face.
It's called a pyramid!
bottom right
In a right angle triangle, the line across from the riht angle is called the hypotenuse.
An equilateral triangle and an isoceles triangle have one line of symmetry.