Week 12 · Shapes and the end of the trail
Tuesday
Shapes that share
// Quadrilaterals, equal parts and a big review
⏱ about 15 min
Tuesday: Shapes that share
At Shape Hollow, Ferris finds a pile of shape signs.
"Let us sort them," he says. "But how?"
Bennie picks up a square sign.
"This square has 4 square corners, like a rectangle," he says.
"It also has 4 equal sides, like a rhombus."
Ferris tilts his head. "So the square fits in both groups!"
Learn it: attributes make groups
An attribute is something true about a shape.
A rectangle has 4 square corners.
A rhombus has 4 sides of the same length.
A square has both! So a square is a rectangle and a rhombus.
All of them have 4 sides, so all are quadrilaterals.
WHICH ATTRIBUTE?
- Read the question.
- Tap your answer.
What do a square and a rectangle share?
What do a square and a rhombus share?What do all quadrilaterals share?
Which shape is both a rectangle and a rhombus?
SORT THE SHAPE
- Read the question.
- Tap your answer.
Is a square a rectangle?Is every rectangle a square?Is this rhombus a rectangle?
Is this parallelogram a quadrilateral?Learn it: quadrilaterals that are none of these
Some quadrilaterals are not squares, rectangles or rhombuses.
They have 4 sides, but no square corners and no equal sides.
WHICH ONE IS IT?
- Read the question.
- Tap your answer.
This shape has 4 sides and no square corners. Can it be a rectangle?Which group does every square, rhombus and rectangle belong to?
Think about the attributes of each group.
| Sentence | True or false? |
|---|---|
| Every square is a rectangle. | ? |
| Every rectangle is a square. | ? |
| Every square is a rhombus. | ? |
| Every quadrilateral has a square corner. | ? |
WHY THIS EXERCISESome rectangles have sides of different lengths, and some quadrilaterals have no square corners.
Try it
Use the corner of a sheet of paper to test corners.
If a corner fits it exactly, it is a square corner.
Test a book, a box and a picture frame.
If a corner fits it exactly, it is a square corner.
Test a book, a box and a picture frame.
Draw a quadrilateral that is not a square, rectangle or rhombus.
Good sorting! Tomorrow we split shapes into equal parts.