3. You wanna know how?? First there are 3 triangles that touch the base, so there are only 3 lateral faces. :)
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A triangular prism.
Yes, the two bases are triangles, the 3 lateral faces are rectangles.
A triangular prism has two three-sided bases and three rectangular lateral faces. A triangular prism has five faces, six vertices and nine edges.
isoscles triangle