Mat_3r_UD3_Plane figures Mat_3r_UD3_Plane figures Mat_3r_UD3_Plane figures Mat_3r_UD3_Plane figures Mat_3r_UD3_Plane figures Mat_3r_UD3_Plane figures

1. Maths3rd
grade- Unit 3:
PLANE
FIGURESby MariaAdrover
CEIPCALONGE

2. POLYGONS: Definition and parts
●A polygon is a closed polygonal line (straight) and its
inside.

3. THE MOST COMMON POLYGONS
● Remember! The polygons are classified by the
number of sides

4. THE TRIANGLES
● A triangle is a polygon with 3 sides, 3 vertexes
and 3 angles.

5. Classifying triangles by sides

6. Classifying triangles by angles

7. THE QUADRILATERALS
● A quadrilateral is a polygon with 4 sides, 4
vertexes and 4 angles.

8. Classifying quadrilaterals

9. Types of parallelograms

10. THE PERIMETER
● The perimeter of a polygon is the addition (+) of
all the sides lenghts.

11. THE SQUARE CENTIMETRE (cm2)
● The area is the number of square centimetres
needed to cover a figure.

12. AREA OF THE RECTANGLE

13. AREA OF THE SQUARE

14. CIRCLE AND CIRCUMFERENCE

15. PARTS OF A CIRCLE

16. HOW TO USE A COMPASS
1.Mark the center of the circumference.
2.Stick the compass needle into the centre.
3.Turn the compass.