1. Geometry

2. Shapes have different names based on how many _________ they have
Shapes have different names based on how many _________ they have. 3 sides = T 4 sides = Q 5 sides = P 6 sides = H 7 sides = H 8 sides = O 9 sides = N 10 sides = D
sides
riangle
uadrilateral
entagon
exagon
eptagon
ctagon
onagon
ecagon

3. Triangles
There are 4 types of triangle. Scalene Isosceles Equilateral Right Angle

4. Scalene triangles have 3 sides of different lengths.

5. Isosceles triangles have 2 sides the same length
Isosceles triangles have 2 sides the same length. Those sides are marked with short lines.

6. Equilateral triangles have 3 sides the same length
Equilateral triangles have 3 sides the same length. Those sides are marked with short lines.

7. Right angle triangles have one corner that is 90 degrees
Right angle triangles have one corner that is 90 degrees. This corner is marked with a small square.

8. Quadrilaterals
Quadrilaterals have ____ sides. There are many special types of quadrilaterals. 4
Rectangle
Square

9. Parallelagram
Rhombus

10. Diamond
Trapezium

11. Kite
Irregular
Quadrilateral

12. Interior Angles
The interior angles of a shape are the angles __________ the shape. The angles add up to an amount that depends on the number of sides the shape has. More sides means bigger total angle.
inside

13. Sides
Total Interior Angles 3
180 4
360 5
540 6 7 8 9 10
720
900
1080
1260
1440

14. We can use the total interior angles to calculate any missing angles
We can use the total interior angles to calculate any missing angles. Subtract what we know from the total and what is left is the missing angle.

15. Triangles add up to 180 degrees
Triangles add up to 180 degrees. Something = – 37 – 71 = 72 The missing angle is 72 degrees.

16. ExteriorAngles
The interior angles of a shape are the angles __________ the shape. To measure the angle you make each side a little longer. To make angles at each corner.
outside

17. Exterior angles always add up to 360, no matter how many sides the shape has.