3D means three-dimensional.
3D shapes are solid shaped and have 3 dimensions – Length, Width, and Height.
These shapes have vertices, faces and edges.
A face is a flat surface.
An edge is a line between two faces.
A vertex(corner) is a point where two edges meet.
Let’s learn about the properties of different 3D shapes.
Cuboid
A cuboid is a 3d shape made up of rectangles and squares.
A cuboid has:
6 faces: 4 rectangular and 2 square
8 vertices
12 edges
Cube
A cube is a box-shaped solid object. It is made up of squares.
A cube has:
6 faces (all squared)
8 vertices
12 edges
Sphere
A sphere is round in shape like a ball.
A sphere has:
One curved face
Cylinder
A cylinder is a can-like 3d shape.
A cylinder has
3 faces 2 circular and 1 rectangular
2 curved edges
Cone
A cone is a cap liked 3d shape.
It has
One circular face
One vertex
Let’s answer some questions:
Question 1: Identify the shape that has
3 faces- 2 circular and 1 rectangular
2 curved edges
Answer:
A cylinder is a can-like 3d shape. A cylinder has 3 faces i.e. 2 circular and 1 rectangular. A cylinder has 2 curved edges.
Question 2:
A cuboid has ____ faces, _____ vertices and _____ edges.
Explanation:
A cuboid is a 3d shape that has
6 faces: 4 rectangular and 2 square
8 vertices
12 edges
A cuboid has 6 faces, 8 vertices, and 12 edges.