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**SECOND TERM E-LEARNING NOTE **

**CLASS: JS2 (BASIC 8)**

**SUBJECT: BASIC TECHNOLOGY**

__WEEK TWO__

**CLASS: JSS TWO**

**TOPIC: ****TRIANGLES**

__SUB-TOPICS:__

- Triangle and its types
- Inscribed and circumscribed circles in a given triangle

**Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)**

__Sub-Topic I:__** Triangle and its types**

A triangle is a plane figure bounded by three straight lines. The figure below shows the typical shape of a triangle. The sum total of all the angles in a triangle is 180^{0. } Triangles are described by:

- The lengths of their sides
- The sizes of their angle; and
- A combination of both lengths of sides and sizes of angles

**Types of triangle**

- Right angled triangle: – a right-angled triangle has one angle equal to 90
^{0}. The side opposite the 90^{0 }is called the hypotenuse. - Equilateral triangle: – An equilateral triangle has all the three sides and angles equal.
- Isosceles triangle: An Isosceles triangle has two equal sides and angles
- Scalene triangles: – A scalene triangle has three unequal sides and angles.
- Obtuse-angled triangle: – It has one of its angles more than 90
^{0}

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