WELCOME WELCOME TO THE TO THE MATH MATH

LESSONLESSON

TRIANGLESTRIANGLESINDICATORS : 1. To determine kinds of triangles based

on the lengths of their side2. To determine kinds of triangles based

on the sizes of their angles 3. To determine kinds of triangles based

on the lenghts of their sides and the sizes of their angles

Key word : Rectangle Diagonal Side Angle Right angled triangle

1.Kinds of triangles based on 1.Kinds of triangles based on the lengths of sidesthe lengths of sides

Types of triangle CharacteristicTypes of triangle CharacteristicEquilateral triangleEquilateral triangle

606000

6060oo 60 6000

3 equal sides3 equal angles

3 lines of symmetry

Types of triangle CharacteristicTypes of triangle Characteristic Isosceles triangleIsosceles triangle X X X X

2 equal sides

2 equal angles

1 line of symmetry

Types of triangle CharacteristicTypes of triangle Characteristic Scalene triangle Scalene triangle 606000

707000 50 5000

All sides have different length

All angles have different measure

2.Kind of triangle based on 2.Kind of triangle based on the sizes of their angles:the sizes of their angles:

No Types of triangle No Types of triangle CharacteristicCharacteristic

1.1. Acute triangle Acute triangle

8080ºº

60º60º 40º40º

All angles are less than 900

No. Types of triangle CharacteristicNo. Types of triangle Characteristic

22 Obtuse triangle Obtuse triangle

3030º 40ºº 40º

110º110º

It has one angle more than 900

No. Types of triangle CharacteristicNo. Types of triangle Characteristic

33 Right triangle Right triangle

It has a right angle

3.Kinds of triangles on the 3.Kinds of triangles on the basic of basic of

the lenghts of their sides and the lenghts of their sides and thethe

sizes of their angles sizes of their anglesNo. Types of triangle No. Types of triangle CharacteristicCharacteristic

1 Isosceles triangle1 Isosceles triangle

2 equal sides

1 right angle

No. Types of Triangle No. Types of Triangle CharacteristicCharacteristic

2 2 isosceles obtuse triangleisosceles obtuse triangle

40º40º 40 4000

100º100º

2 equal sides

1 obtuse angle

CONCLUSION :CONCLUSION :Kinds Of Triangles :Kinds Of Triangles :1. Based on the lenghts of their 1. Based on the lenghts of their

sides :sides : a. Equilateral trianglea. Equilateral triangle b. Isosceles triangleb. Isosceles triangle c. Scalene trianglec. Scalene triangle

2. Based on the sizes :2. Based on the sizes : a. Acute trianglea. Acute triangle b. Obtuse triangle b. Obtuse triangle c. Right trianglec. Right triangle

3. Based on the lenghts of3. Based on the lenghts of their sides and the sizes of their sides and the sizes of their angle: their angle: 1. Isosceles right triangle1. Isosceles right triangle 2. Isosceles obtuse triangle2. Isosceles obtuse triangle 3. Isosceles acute triangle3. Isosceles acute triangle

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