Q: How many faces does a 2d triangle have?

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a 2d triangle has 1 face known as a plane but a triangular prism has 4 faces

1 Face (2D) 4 Faces (3D) 3 Sides 3 Points, and 2 Congruent sides.

By its very nature of being a triangle, and a 2D shape, a triangle cannot have four plane faces. However, a tetrahedron is a polyhedron made up of four triangular faces.

all 2D figures have 1 face.

One.

Related questions

One

trianle have no faces, because it is 2D figure.

a 2d triangle has 1 face known as a plane but a triangular prism has 4 faces

1 for a 2d and triangular pyramid-5 

Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.

1 Face (2D) 4 Faces (3D) 3 Sides 3 Points, and 2 Congruent sides.

4

By its very nature of being a triangle, and a 2D shape, a triangle cannot have four plane faces. However, a tetrahedron is a polyhedron made up of four triangular faces.

no stupid because one has got faces(3d) and the other has sides(2d)

all 2D figures have 1 face.

One.

it can have 1 if it is a right triangle.