JSS2 Second Term Basic Technology Lesson Note – Triangles

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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

1. Right angled triangle: – a right-angled triangle has one angle equal to 90⁰. The side opposite the 90⁰ is called the hypotenuse.
2. Equilateral triangle: – An equilateral triangle has all the three sides and angles equal.
3. Isosceles triangle: An Isosceles triangle has two equal sides and angles
4. Scalene triangles: – A scalene triangle has three unequal sides and angles.
5. Obtuse-angled triangle: – It has one of its angles more than 90⁰

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