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Diketahui segitiga siku-siku berikut Tentukan perbandingan trigonometri segitiga di atas sin α = cos α = tan α = sec α = csc α = cot α =

Diketahui segitiga siku-siku berikut

Tentukan perbandingan trigonometri segitiga di atas

 

 

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I. Sutiawan

Master Teacher

Mahasiswa/Alumni Universitas Pasundan

Jawaban terverifikasi

Jawaban

nilai dari , , , , ,

nilai dari sin space alpha equals 3 over 5table attributes columnalign right center left columnspacing 0px end attributes row cell cos space alpha end cell equals cell 4 over 5 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell tan space alpha end cell equals cell 3 over 4 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell sec space alpha end cell equals cell 5 over 4 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell csc space alpha end cell equals cell 5 over 3 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell cot space alpha end cell equals cell 4 over 3 end cell end table 

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Pembahasan

Diketahui segitiga ABC siku-siku di B, sehingga berlaku teorema Pythagoras sebagai berikut: Karena panjang seagitiga tidak mungkin negatif, maka yang memenuhi adalah . Maka: Jadi, nilai dari , , , , ,

Diketahui segitiga ABC siku-siku di B, sehingga berlaku teorema Pythagoras sebagai berikut:

table attributes columnalign right center left columnspacing 0px end attributes row cell AB squared end cell equals cell AC squared minus BC squared end cell row blank equals cell 10 squared minus 8 squared end cell row blank equals cell 100 minus 64 end cell row blank equals 36 row blank blank blank row AB equals cell plus-or-minus 6 space cm end cell end table

Karena panjang seagitiga tidak mungkin negatif, maka yang memenuhi adalah AB equals 6 space cm. Maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space alpha end cell equals cell AB over AC end cell row blank equals cell 6 over 10 end cell row blank equals cell 3 over 5 end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space alpha end cell equals cell BC over AC end cell row blank equals cell 8 over 10 end cell row blank equals cell 4 over 5 end cell end table 

 table attributes columnalign right center left columnspacing 0px end attributes row cell tan space alpha end cell equals cell AB over BC end cell row blank equals cell 6 over 8 end cell row blank equals cell 3 over 4 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell sec space alpha end cell equals cell AC over BC end cell row blank equals cell 10 over 8 end cell row blank equals cell 5 over 4 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell csc space alpha end cell equals cell AC over AB end cell row blank equals cell 10 over 6 end cell row blank equals cell 5 over 3 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell cot space alpha end cell equals cell BC over AB end cell row blank equals cell 8 over 6 end cell row blank equals cell 4 over 3 end cell end table

Jadi, nilai dari sin space alpha equals 3 over 5table attributes columnalign right center left columnspacing 0px end attributes row cell cos space alpha end cell equals cell 4 over 5 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell tan space alpha end cell equals cell 3 over 4 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell sec space alpha end cell equals cell 5 over 4 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell csc space alpha end cell equals cell 5 over 3 end cell end tabletable attributes columnalign right center left columnspacing 0px end attributes row cell cot space alpha end cell equals cell 4 over 3 end cell end table 

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