a
What does congruent mean?
The same
What does it mean when a 3D object is oblique?
The 3D shape is in a slanted or tilted direction
How many faces does a cylinder have?
Three
True of false: Cylinders have two congruent faces that are parallel to each other
True
In 3D shapes, parallel means that...
- a) the lines/edges/faces extend in the same direction and never intersect
- b) the lines/edges/faces don't intersect but intersect during building the net
- c) the lines/edges/faces touch each other
a) the lines/edges/faces extend in the same direction and never intersect
What is the common point called where all the triangular faces of a pyramid's net meet when folded?
The apex
If you unfold a cube, what shapes do you see and how many?
6 squares
Make the rectangle part bigger
True or false: two different nets can make the same 3D shape
True
Is this net for a hexagonal prism?
No, this is a net for a pentagonal prism
True or false: Plane symmetry is when a shape looks the same after it's been turned or rotated less than one full turn
False. Plane symmetry is when a 3D object can be sliced by a flat, imaginary surface (a "plane") into two identical halves that are mirror images of each other.
Does a right pyramid with a trapezoidal base, with no lines of symmetry, have rotational symmetry?
No
Which 3d shape has infinite rotational symmetry?
1. Cylinder
2. Triangular-based prism
3. Circle
4. Any right pyramid
The cylinder
Which DOES NOT have rotational symmetry?
- An oblique cylinder
- A 2D square
- Triangular-based prism
- A circle
Oblique cylinder
Can a prism have curved surfaces?
No
A square pyramid has 5 faces. How many edges meet at the apex?
Four
Which 3D shape does not have a net?
- Cone
- Sphere
- Any oblique prism
Sphere
If you colour one face of a cube net red, how many faces will touch it when folded?
Four
What 3D shape is this?
- Triangular pyramid
- Triangle based prism
- Octahedron
- Octagonal prism
Octahedron
What 3D shape has 5 faces, 9 edges, and 6 vertices?
Which 3D shape has the same number of faces and vertices?
- Square based pyramid
- Cylinder
- Triangular prism
- Octagonal prism
- None of the above
Square based pyramid