It depends on the pyramids.
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One possibility is two square based pyramids fused together on their square sides.
The three pyramids that i know of is a :) Triangular based pyramid :) Square based pyramid :) Hexagonal based pyramid
to conclude you data is by explaining what you did or do ;)
Three.A triangular dipyramid (two triangular pyramids stuck together),A quadrilateral based pyramidA triangle base with two apices (apexes) above the base.I don't think there are any more.Three.A triangular dipyramid (two triangular pyramids stuck together),A quadrilateral based pyramidA triangle base with two apices (apexes) above the base.I don't think there are any more.Three.A triangular dipyramid (two triangular pyramids stuck together),A quadrilateral based pyramidA triangle base with two apices (apexes) above the base.I don't think there are any more.Three.A triangular dipyramid (two triangular pyramids stuck together),A quadrilateral based pyramidA triangle base with two apices (apexes) above the base.I don't think there are any more.
Yes. A square consists of two pairs of parallel lines!