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Persegi ABCD dengan A ( 3 , 1 ) , B ( 3 , 4 ) , C ( 6 , 4 ) , dan D ( 6 , 1 ) didilatasi terhadap pusat N ( 2 , 1 ) dan faktor skala = 2 . Tentukan: a. bayangan persegi . ( Kinomatika 2013 )

Persegi  dengan , dan  didilatasi terhadap pusat  dan . Tentukan:

a. bayangan persegi undefined.

(Kinomatika 2013)

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O. Rahmawati

Master Teacher

Mahasiswa/Alumni UIN Sunan Gunung Djati Bandung

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Pembahasan

Apabila suatu titik didilatasi terhadap pusat dan faktor skala : Menentukan bayangan persegi : Titik : Titik : Titik : Titik : Jadi, bayangan persegi adalah .

Apabila suatu titik didilatasi terhadap pusat P left parenthesis a comma b right parenthesis dan faktor skala k:

open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row k 0 row 0 k end table close parentheses open parentheses table row cell x minus a end cell row cell y minus b end cell end table close parentheses plus open parentheses table row a row b end table close parentheses

Menentukan bayangan persegi A B C D:

  • Titik A apostrophe:

open parentheses table row cell x subscript A apostrophe end cell row cell y subscript A apostrophe end cell end table close parentheses equals open parentheses table row k 0 row 0 k end table close parentheses open parentheses table row cell x subscript A minus a end cell row cell y subscript A minus b end cell end table close parentheses plus open parentheses table row a row b end table close parentheses open parentheses table row cell x subscript A apostrophe end cell row cell y subscript A apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row cell 3 minus 2 end cell row cell 1 minus 1 end cell end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript A apostrophe end cell row cell y subscript A apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row 1 row 0 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript A apostrophe end cell row cell y subscript A apostrophe end cell end table close parentheses equals open parentheses table row 2 row 0 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript A apostrophe end cell row cell y subscript A apostrophe end cell end table close parentheses equals open parentheses table row 4 row 1 end table close parentheses

  • Titik B apostrophe:

open parentheses table row cell x subscript B apostrophe end cell row cell y subscript B apostrophe end cell end table close parentheses equals open parentheses table row k 0 row 0 k end table close parentheses open parentheses table row cell x subscript B minus a end cell row cell y subscript B minus b end cell end table close parentheses plus open parentheses table row a row b end table close parentheses open parentheses table row cell x subscript B apostrophe end cell row cell y subscript B apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row cell 3 minus 2 end cell row cell 4 minus 1 end cell end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript B apostrophe end cell row cell y subscript B apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row 1 row 3 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript B apostrophe end cell row cell y subscript B apostrophe end cell end table close parentheses equals open parentheses table row 2 row 6 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript B apostrophe end cell row cell y subscript B apostrophe end cell end table close parentheses equals open parentheses table row 4 row 7 end table close parentheses

  • Titik C apostrophe:

open parentheses table row cell x subscript C apostrophe end cell row cell y subscript C apostrophe end cell end table close parentheses equals open parentheses table row k 0 row 0 k end table close parentheses open parentheses table row cell x subscript C minus a end cell row cell y subscript C minus b end cell end table close parentheses plus open parentheses table row a row b end table close parentheses open parentheses table row cell x subscript C apostrophe end cell row cell y subscript C apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row cell 6 minus 2 end cell row cell 4 minus 1 end cell end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript C apostrophe end cell row cell y subscript C apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row 4 row 3 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript C apostrophe end cell row cell y subscript C apostrophe end cell end table close parentheses equals open parentheses table row 8 row 6 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript C apostrophe end cell row cell y subscript C apostrophe end cell end table close parentheses equals open parentheses table row 10 row 7 end table close parentheses

  • Titik D apostrophe:

open parentheses table row cell x subscript D apostrophe end cell row cell y subscript D apostrophe end cell end table close parentheses equals open parentheses table row k 0 row 0 k end table close parentheses open parentheses table row cell x subscript D minus a end cell row cell y subscript D minus b end cell end table close parentheses plus open parentheses table row a row b end table close parentheses open parentheses table row cell x subscript D apostrophe end cell row cell y subscript D apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row cell 6 minus 2 end cell row cell 1 minus 1 end cell end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript D apostrophe end cell row cell y subscript D apostrophe end cell end table close parentheses equals open parentheses table row 2 0 row 0 2 end table close parentheses open parentheses table row 4 row 0 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript D apostrophe end cell row cell y subscript D apostrophe end cell end table close parentheses equals open parentheses table row 8 row 0 end table close parentheses plus open parentheses table row 2 row 1 end table close parentheses open parentheses table row cell x subscript D apostrophe end cell row cell y subscript D apostrophe end cell end table close parentheses equals open parentheses table row 10 row 1 end table close parentheses

Jadi, bayangan persegi A B C D adalah A apostrophe left parenthesis 4 comma space 1 right parenthesis comma space B apostrophe left parenthesis 4 comma space 7 right parenthesis comma space C apostrophe left parenthesis 10 comma space 7 right parenthesis comma space D apostrophe left parenthesis 10 comma space 1 right parenthesis.

 

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