Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees...
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Transcript of Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees...
![Page 1: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/1.jpg)
Triangles1st year
P26
Chapter 4
![Page 2: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/2.jpg)
Triangle
• All 3 angles of a triangle must add up to 180 degrees
• There are 3 types of triangles• Equilateral
• Isosceles
• Scalene
![Page 3: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/3.jpg)
3 different types of Triangles
• Equilateral• All sides are the same
Length and angles are 60 degrees
![Page 4: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/4.jpg)
3 different types of Triangles
• Isosceles • 2 sides are the
same length
![Page 5: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/5.jpg)
3 different types of Triangles
• Scalene • All 3 sides different lengths
Angles are all different sizes
![Page 6: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/6.jpg)
How to construct an equilateral Triangle
Draw base line at given measurement.
Either end of the line draw lines up at 60 degrees. Where they meet is the vertex
V
![Page 7: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/7.jpg)
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
![Page 8: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/8.jpg)
Questions
![Page 9: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/9.jpg)
![Page 10: Triangles 1 st year P26 Chapter 4. Triangle All 3 angles of a triangle must add up to 180 degrees There are 3 types of triangles Equilateral Isosceles.](https://reader035.fdocuments.us/reader035/viewer/2022081511/5697bfd31a28abf838cac41b/html5/thumbnails/10.jpg)
Exam Practice