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CLASS:Â JS TWO
WEEK:Â Â THREEÂ Â Â Â Â Â Â Â Â Â Â
TOPIC: QUADRILATERALS AND POLYGONS
SUB-TOPICS:
- Quadrilateral
- Regular and Irregular Polygons
Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)
Sub-Topic I:Â Â Â Â 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 a quadrilateral is known as a diagonal.
Examples of Quadrilateral
- Squares
- Rectangle
- Parallelogram
- Rhombus
- Trapezium
- Kite etc.
Construction of A Square
E.g.: How to construct a square given that one of its sides is 60mm
Procedures
- Draw the given side AB to be 60 mm.
- With centre A and a convenient radius, draw a semicircle at A. use the semicircle to draw a vertical line at AC
- 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.
- Join point D to C and C to B. ABCD is the square required.
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