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A triangular based pyramid has no lines of symmetry. However, if each of the non-base triangular sides are equal it will have 3 planes of symmetry. If the base triangle is also equal, it will have 6 planes of symmetry.
it has 5 planes: the base and 4 sides.
a square based pyrmaid has 24 lines of symitry
-Built for spaceship landing zones -square based -its got 5 planes -If its not a square based pyramid then I'm completely wrong.
a square based pyramid, haha