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PLANE FIGURES
CONTENT
- Properties of Quadrilaterals (i.e. parallelogram, rhombus, and kite)
- Pythagoras
Properties of Quadrilaterals
Any four sided plane figure is called a quadrilateral.
Examples of quadrilaterals are:
A. Parallelogram
A parallelogram is a quadrilateral whose pairs are equal and parallel.
Properties of Parallelogram
- Its opposite sides are parallel and equal
- Its opposite angles are equal
- Its diagonals bisect each other
- Each diagonal bisects the parallelogram into two congruent triangles
- The (4) angles together add up to 3600
Consider the parallelogram below:
Line AB = Line DC = 10cm
Line AB is parallel to line DC
Line AD = Line BC = 4cm
Line AD is parallel to line BC
Angle BAD = Angle BCD
Angle ADC = Angle ABC
Diagonal AC divides the parallelogram ABCD into two congruent triangles ABC and ADC
Diagonal DB divides the parallelogram ABCD into two congruent triangles DAB and DCB
The diagonals bisect each other at point E i.e.
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ClassHall Instructor
Ezimeruwe Oghenekaro
Halima Ahmadu
Sadiq Barau