JSS2 Basic Technology Lesson Note on Triangles

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CLASS:  JS TWO

TOPIC: TRIANGLES

SUB-TOPICS:

1. Triangle and its types
2. 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

1. The lengths of their sides
2. The sizes of their angle; and
3. 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

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