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(kongruen) Jika    Tentukan: b) Besar

begin mathsize 14px style triangle ABC approximately equal to triangle DEF end style (kongruen)

Jika
 begin mathsize 14px style angle straight A equals 90 degree comma space BC equals 5 space cm angle straight F equals 65 degree comma space BC equals 3 comma 5 space cm end style 

Tentukan:
b) Besar  begin mathsize 14px style angle straight B comma space angle straight C comma space angle straight D space dan space angle straight E end style 

  1. ...space 

  2. ...space 

Jawaban:

Karena segitiga ABC dan DEF kongruen, maka  sudut-sudut yang bersesuaian sama besar, sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell angle straight A end cell equals cell angle straight E equals 90 degree end cell row cell angle straight F end cell equals cell angle straight C equals 65 degree end cell end table end style

Jumlah sudut dalam segitiga adalah begin mathsize 14px style 180 degree end style, sehingga

begin mathsize 14px style angle straight B equals angle straight D equals 180 degree minus 90 degree minus 65 degree equals 25 degree end style   

Jadi, besar begin mathsize 14px style angle straight B equals 25 degree comma space angle straight C equals 65 degree comma space angle straight D equals 25 degree space dan space angle straight E equals 90 degree end style.

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