Kamis, 01 Januari 2015

TRANSFORMASI GEOMETRI

1. Pengertian Transformasi

Transformasi T dibidang adalah suatu pemetaan titik pada suatu bidang ke himpunan titik pada bidang yang sama. Jenis-jenis transformasi yang dapat dilakukan antara lain :
  1. Translasi (Pergeseran)
  2. Refleksi (Pencerminan)
  3. Rotasi (Perputaran)
  4. Dilatasi (Perkalian)

2. Translasi dan Operasinya
Translasi (pergeseran) adalah pemindahan suatu objek sepanjang garis lurus dengan arah dan jarak tertentu.

Jika translasi  memetakan titik P (x, y) ke titik P’(x’, y’) maka x’ = x + a dan y’ = y + b atay P’ (x + a, y + b ) ditulis dalam bentuk :

 


3. Refleksi (Pencerminan)
a. Pencerminan terhadap sumbu x
Matriks percerminan :
b. Pencerminan Terhadap sumbu y
Matriks Pencerminan:

c. Pencerminan terhadap garis y = x
Matriks Pencerminan
d. Pencerminan terhadap garis y = -x
Matriks Pencerminan:
e. Pencerminan terhadap garis x = h
Matriks Pencerminan: 
Sehingga:
f. Pencerminan terhadap garis y=k
Matriks Pencerminan : 
Sehingga:


g. Pencerminan terhadap titik asal O (0, 0)
Matriks Pencerminan : 
Sehingga:
h. Pencerminan terhadap garis y = mx dimana m = tan q

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