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Lesson 1: Geometric solids (3D shapes)

# Counting faces and edges of 3D shapes

Learn about shapes! Discover how to count faces and edges on 3D figures. We explore a transparent shape with five faces and another shape, a square pyramid, with eight edges and five faces. It's a colorful journey into geometry!

## Want to join the conversation?

• are vertices the same as edges
• No, vertices are like corners where three faces meet, with the exception of the apex, in which 4 or more faces meet in a pyramid.
• how can i identify faces and edges of a sphere? maybe its silly to ask but i am curious.
• A face is a flat surface on a solid, and edges are the lines at which faces meet, and a vertex is the point at which when three or more edges meet. A sphere has no flat surfaces, so it has no faces. Since it doesn't have faces, it can't have edges, or vertices.
• i am not even doing this in class
• ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣷⣶⣤⣄⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⣿⣿⣿⣿⣷⡒⢄⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⣿⣿⣿⣿⣿⣆⠙⡄⠀⠐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣤⣤⣤⣤⣤⣤⣤⣤⣤⠤⢄⡀⠀⠀⣿⣿⣿⣿⣿⣿⡆⠘⡄⠀⡆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠙⢿⣿⣿⣿⣿⣿⣿⣿⣦⡈⠒⢄⢸⣿⣿⣿⣿⣿⣿⡀⠱⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⣿⣿⣿⣿⣿⣿⣿⣦⠀⠱⣿⣿⣿⣿⣿⣿⣇⠀⢃⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⢿⣿⣿⣿⣿⣿⣿⣷⡄⣹⣿⣿⣿⣿⣿⣿⣶⣾⣿⣶⣤⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⢻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣴⣶⣿⣭⣍⡉⠙⢻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⢀⣠⣶⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡇⠀⠀⠀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠉⠉⠛⠻⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡷⢂⣓⣶⣶⣶⣶⣤⣤⣄⣀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠙⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⢿⣿⣿⣿⠟⢀⣴⢿⣿⣿⣿⠟⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⠛⠋⠉⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠤⠤⠤⠤⠙⣻⣿⣿⣿⣿⣿⣿⣾⣿⣿⡏⣠⠟⡉⣾⣿⣿⠋⡠⠊⣿⡟⣹⣿⢿⣿⣿⣿⠿⠛⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣤⣶⣤⣭⣤⣼⣿⢛⣿⣿⣿⣿⣻⣿⣿⠇⠐⢀⣿⣿⡷⠋⠀⢠⣿⣺⣿⣿⢺⣿⣋⣉⣉⣩⣴⣶⣤⣤⣄⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠉⠛⠻⠿⣿⣿⣿⣇⢻⣿⣿⡿⠿⣿⣯⡀⠀⢸⣿⠋⢀⣠⣶⠿⠿⢿⡿⠈⣾⣿⣿⣿⣿⡿⠿⠛⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⠻⢧⡸⣿⣿⣿⠀⠃⠻⠟⢦⢾⢣⠶⠿⠏⠀⠰⠀⣼⡇⣸⣿⣿⠟⠉⠀⠀⢀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣴⣾⣶⣽⣿⡟⠓⠒⠀⠀⡀⠀⠠⠤⠬⠉⠁⣰⣥⣾⣿⣿⣶⣶⣷⡶⠄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠉⠉⠉⠹⠟⣿⣿⡄⠀⠀⠠⡇⠀⠀⠀⠀⠀⢠⡟⠛⠛⠋⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⠋⠹⣷⣄⠀⠐⣊⣀⠀⠀⢀⡴⠁⠣⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⣀⠤⠊⢁⡸⠀⣆⠹⣿⣧⣀⠀⠀⡠⠖⡑⠁⠀⠀⠀⠑⢄⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣰⣦⣶⣿⣿⣟⣁⣤⣾⠟⠁⢀⣿⣆⠹⡆⠻⣿⠉⢀⠜⡰⠀⠀⠈⠑⢦⡀⠈⢾⠑⡾⠲⣄⠀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⣀⣤⣶⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠖⠒⠚⠛⠛⠢⠽⢄⣘⣤⡎⠠⠿⠂⠀⠠⠴⠶⢉⡭⠃⢸⠃⠀⣿⣿⣿⠡⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⡤⠶⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣋⠁⠀⠀⠀⠀⠀⢹⡇⠀⠀⠀⠀⠒⠢⣤⠔⠁⠀⢀⡏⠀⠀⢸⣿⣿⠀⢻⡟⠑⠢⢄⡀⠀⠀⠀⠀
⠀⠀⠀⠀⢸⠀⠀⠀⡀⠉⠛⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣄⣀⣀⡀⠀⢸⣷⡀⣀⣀⡠⠔⠊⠀⠀⢀⣠⡞⠀⠀⠀⢸⣿⡿⠀⠘⠀⠀⠀⠀⠈⠑⢤⠀⠀
⠀⠀⢀⣴⣿⡀⠀⠀⡇⠀⠀⠀⠈⣿⣿⣿⣿⣿⣿⣿⣿⣝⡛⠿⢿⣷⣦⣄⡀⠈⠉⠉⠁⠀⠀⠀⢀⣠⣴⣾⣿⡿⠁⠀⠀⠀⢸⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⡜⠀⠀
⠀⢀⣾⣿⣿⡇⠀⢰⣷⠀⢀⠀⠀⢹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣦⣭⣍⣉⣉⠀⢀⣀⣤⣶⣾⣿⣿⣿⢿⠿⠁⠀⠀⠀⠀⠘⠀⠀⠀⠀⠀⠀⠀⠀⠀⡰⠉⢦⠀
⢀⣼⣿⣿⡿⢱⠀⢸⣿⡀⢸⣧⡀⠀⢿⣿⣿⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡭⠖⠁⠀⡠⠂⠀⠀⠀⠀⠀⠀⠀⠀⢠⠀⠀⠀⢠⠃⠀⠈⣀
⢸⣿⣿⣿⡇⠀⢧⢸⣿⣇⢸⣿⣷⡀⠈⣿⣿⣇⠈⠛⢿⣿⣿⣿⣿⣿⣿⠿⠿⠿⠿⠿⠿⠟⡻⠟⠉⠀⠀⡠⠊⠀⢠⠀⠀⠀⠀⠀⠀⠀⠀⣾⡄⠀⢠⣿⠔⠁⠀⢸
⠈⣿⣿⣿⣷⡀⠀⢻⣿⣿⡜⣿⣿⣷⡀⠈⢿⣿⡄⠀⠀⠈⠛⠿⣿⣿⣿⣷⣶⣶⣶⡶⠖⠉⠀⣀⣤⡶⠋⠀⣠⣶⡏⠀⠀⠀⠀⠀⠀⠀⢰⣿⣧⣶⣿⣿⠖⡠⠖⠁
⠀⣿⣿⣷⣌⡛⠶⣼⣿⣿⣷⣿⣿⣿⣿⡄⠈⢻⣷⠀⣄⡀⠀⠀⠀⠈⠉⠛⠛⠛⠁⣀⣤⣶⣾⠟⠋⠀⣠⣾⣿⡟⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣿⠷⠊⠀⢰⠀
⢰⣿⣿⠀⠈⢉⡶⢿⣿⣿⣿⣿⣿⣿⣿⣿⣆⠀⠙⢇⠈⢿⣶⣦⣤⣀⣀⣠⣤⣶⣿⣿⡿⠛⠁⢀⣤⣾⣿⣿⡿⠁⠀⠀⠀⠀⠀⠀⠀⣸⣿⡿⠿⠋⠙⠒⠄⠀⠉⡄
⣿⣿⡏⠀⠀⠁⠀⠀⠀⠉⠉⠙⢻⣿⣿⣿⣿⣷⡀⠀⠀⠀⠻⣿⣿⣿⣿⣿⠿⠿⠛⠁⠀⣀⣴⣿⣿⣿⣿⠟⠀⠀⠀⠀⠀⠀⠀⠀⢠⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠰
• Do we have to add up all the sides together?
• So this video really made me better.
• What is the difference between faces and edges?
• The difference between faces and edges is that faces are flat surfaces of a solid shape, while edges are line segments where two faces meet. For example, a cube has six faces, each of which is a square, and twelve edges, each of which is a line segment connecting two squares. You can see an illustration of a cube with its faces and edges labeled here. A face can also be curved, such as the surface of a sphere or a cylinder. An edge can also be curved, such as the boundary of a circle or an ellipse. I hope this helps.