JSS2 Second Term Basic Technology Lesson Note – Quadrilaterals and Polygons

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WEEK THREE

CLASS:  JS TWO

WEEK:   THREE           

TOPIC: QUADRILATERALS AND POLYGONS

SUB-TOPICS:

• Quadrilateral
• Regular and Irregular Polygons

Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)

Sub-Topic I:     QUADRILATERAL

What is a Quadrilateral?

A quadrilateral is a plane figure bounded by four straight sides and whose four angles add up to 360⁰. The line joining two opposite corners of quadrilateral is known as diagonal.

Examples of Quadrilateral

1. Squares
2. Rectangle
3. Parallelogram
4. Rhombus
5. Trapezium
6. Kite etc.

Construction of A Square

E.g.: How to construct a square given that one of its sides is 60mm

Procedures

1. Draw the given side AB to be 60 mm.
2. With centre A and a convenient radius, draw a semicircle at A. use the semicircle to draw a vertical line at AC
3. With center A and a radius AB, draw an ardc to cut the vertical line at D with center B and with the same radius, draw an arc at C. Again, with center Dand the same radius, draw another arc to cut the one at C.
4. Join point D to C and C to B. ABCD is the square required.

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