You can count sides and vertices to name two-dimensional shapes. Look at how many sides and vertices each shape has
"Let's Explore the Shape Kingdom!"
A story-based interactive GeoGebra Book for Year 1 Mathematics (Malaysia KSSR) Students will be able to: Recognise 2D shapes: Circle Square Rectangle Triangle Name the shapes. Describe the number of sides and corners (where appropriate). Identify shapes in everyday objects. Create pictures using shapes.
Table des matières
- Welcome to Shape Kingdom
- About 2D shapes in Primary School
- Geometry 2D - Shapes Activity in Primary school
- Meet Circle
- 1d slice of 2d circle
- Large Circle or Small Circle?
- 1d slice of 2d circle
- Meet Square
- Square
- Square Area
- Meet Rectangle
- Rectangle
- Rectangle Template with Investigation Questions
About 2D shapes in Primary School
2D shapes
You can count [u]sides[/u] and [u]vertices[/u] to name two-dimensional shapes.
2D shapes
Different Shapes according their sides and vertices
Match the shape and their name
sides and vertex
Answer the question
A square has
A figure with 3 sides and 3 vertices is a...
A pentagon has
1d slice of 2d circle
Square
Definition
A plane convex quadrilateral is a square if, and only if, all four sides and angles are congruent.
Square
REFLECTION
Every square is a rectangle as well as a rhombus.
Exercise
Every square is:[br][br][br]
Rectangle
Definition
[justify]A plane convex quadrilateral is a rectangle if, and only if, all four angles are congruent. [br][b]Note: Since all four angles are congruent and the sum of the internal angles of the quadrilateral is 360º, then each angle measures 90º.[/b][/justify]
Rectangle
Property of Rectangle
In every rectangle, all diagonals are congruent.[br]
Argument
Exercise
Research and prove the argument of following property: Every parallelogram that has congruent diagonals is a rectangle."