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Okay, this time I will write 'bout some characteristics of quadrilateral that I got in my first semester (Telaah Buku Teks Matematika Bahasa Inggris) from Drs. Purwoko, M. Si on October rain 2011. Let's sing together!!
Triangle triangle triangle . . . (Pelangi-Pelangi song).

1. SQUARE
    - 4 equal sides
    - 4 right angles
    - 2 equal diagonals
    - 2 diagonal are perpendicular each other


2. PARALLELOGRAM
    - 2 pairs of equal sides
    - 2 pairs of faced equal angles
    - 2 diagonals intersecting at each middle

3. RECTANGULAR
    - 2 pairs of parallel sides
    - 2 equal diagonals
    - 4 right angles

4. KITE
    - 2 pairs of equal sides
    - a pair of faced equal angle

5. RHOMBUS
    - 2 diagonals are perpendicular each other
    - 2 diagonals are intersecting at each middle
    - 2 pairs of faced equal angle
    - 4 equal sides
    - 2 pairs of parallel sides

6. TRAPEZOID
    - a pair of parallel side

Extras:
Triangular Shapes:
* based on angle:                          *based on side:
   - right                                          - irregular
   - acute                                         - equailateral
   - obtuse                                       - isoscales

Part of Circles:
- radius                            - lenght
- diameter                       - segment
- circumference               - tangent
- chord                            - arc
- sector                           - apotema

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