Flat pictures and solid objects
Distinguish plane shapes from solids and find shapes on flat faces.
Start with the activity ↓Are a ball and a circle the same thing?
A circle drawn on paper is a plane shape. A ball occupies space: it is a solid. Look for shapes on flat faces.
You draw a circle to represent a ball. It reminds you of a ball, but the drawing cannot be held like a real ball. Separate the represented object from the shape on paper.
A cube, like an ideal die, has flat faces. Trace one face on paper and you obtain a square. The whole solid is not a square; one face has that shape.
A cylinder has a flat circular face at each end. It can stand on a flat end and roll on its curved side. The way a solid moves depends on how it is placed.
A sphere is round and has no flat face. A ball appearing circular in a drawing does not mean a flat circular face is attached to it.
One box and one ball have the same count. That does not make their shapes, sizes or weights equal. First say which property you are comparing.
Listen one paragraph at a time
1 / 5
2 / 5
3 / 5
4 / 5
5 / 5
Now check it yourself
Choose a cube, cylinder or sphere. Find a flat face and see the shape its outline would make.
The screen shows drawings of ideal solids. Real objects can have thickness or rounded edges.
Try it away from the screen
Examine a box without sharp edges and a ball. Test rolling on the floor; do not stand on objects.
Can you explain another example?
Check your idea 1
Check your idea 2
Can you explain it in a new setting?
Describe a whole cylinder and one end face using different words.
Speak, point or draw on paper. Check whether your own explanation includes these ideas.
Continue reading, or pause here
Shape alone does not tell us a length. Next, measure with a shared unit.