1. Triangles
1st year
P26
Chapter 4

2. Triangle All 3 angles of a triangle must add up to 180 degrees
There are 3 types of triangles
Equilateral
Isosceles
Scalene

3. 3 different types of Triangles
Equilateral
All sides are the same
Length and angles are 60 degrees

4. 3 different types of Triangles
Isosceles
2 sides are the
same length

5. 3 different types of Triangles
Scalene
All 3 sides different lengths
Angles are all different sizes

6. How to construct an equilateral TriangleV
Draw base line at given measurement.
Either end of the line draw lines up at 60 degrees. Where they meet is the vertex

7. How to draw an Isosceles Triangle
What do we know????
2 sides are equal in length and 2 base angles are the same angle.
Use vertically opposite angles to work out base angle
Vertically opposite angle means the angle above the point is equal to the angle below 70
There if all angles of a triangle equal 180 degrees
180
- 70
110 ÷ 2 = 55
Base angles are 55 degrees each

8. Questions

10. Exam Practice