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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 1800.  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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