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วันพุธที่ 17 มิถุนายน พ.ศ. 2563

Learn About Vertices, Edges and Faces

Learn About Vertices, Edges and Faces

Have you ever been given a gift box or party hat? 🎁
They're all 3D shapes.
 3D shapes are made up of verticesedges, and faces!
Vertices, Faces, and Edges
 Vertices are the pointy bits or the corners where edges meet.
 Edges are the lines around a shape.
 Faces are the flat sides that you touch when you hold a shape.
Let's look at how many vertices, edges, and faces different 3D shapes have. 👇

Cubes

Cube - Gift Box
 Cubes have 6 square faces
If you glue 6 square faces together, they becomes a cube with 8 vertices and 12 edges.
Cube - Vertices Faces Edges

Rectangular Prisms

Here's a rectangular shaped gift box:
Rectangular Prism - Gift Box
It's made up of 6 rectangular faces
When you join the sides together, it becomes a rectangular prism with 8 vertices and 12 edges.
Rectangular Prism - Vertices Faces Edges
Tip: All cubes are rectangular prisms, but not all rectangular prisms are cubes. 
It's kind of like how all squares are rectangles, but not all rectangles are squares.

Triangular Prisms

Here's a triangular shaped gift box:
Triangular Prism - Gift Box
It's made up of 5 faces (2 are triangles, 3 are rectangles). 
Triangular prisms have 6 vertices and 9 edges! Can you count them?
Triangular Prism - Vertices Faces Edges

Pyramids

Pyramid Gift Box
Pyramids are made up of 5 faces (4 are triangles, 1 is a square). 
When you join the faces together, it becomes a square-based pyramid with 5 vertices and 8 edges!
Square Pyramid - Vertices Faces Edges

Cylinder

Cylinder Gift Box
Cylinders has 2 circular faces and 1 surface
Curved surfaces doesn't count as faces. Faces are flat
When you wrap the surface around the circles, it becomes a cylinder with 2 edges and 0 vertices
There are no sharp, pointy bits in a cylinder!
Cylinder - Vertices Faces Edges

Cones

Cone Party Hat
Cones like this party hat are made up of 1 surface and 1 circular face.
When you wrap the surface around the circle it becomes a cone with 1 vertex and 1 edge.
Cone - Vertices Faces Edges

Spheres

Spheres have 0 faces0 edges and 0 vertices
Sphere Chocolate
How would you gift wrap a sphere? It's tough without crumpling paper.

Watch and Learn


Great job! Now, you know all about vertices, faces, and edges!
Try the practice questions next. 

 CR  ::  https://classace.io/learn/math/2ndgrade/vertices-edges-and-faces