Mysterious pyramid shadow casts from Pilot Mountain during the spring equinox
Did you know about this spring phenomenon at Pilot Mountain? The pyramid shadow is visible a few hours before sunset this ...
BBC4y
What are 3D shapes?
3D shapes, they have 3 dimensions. Length ... You're now a square based pyramid with 4 triangular faces and a square face for your bottom. You can get pyramids with different shaped bases.