Pertanyaan

Diketahui segitiga A BC , siku-sikudi B , cos α = 5 4 ​ , dan tan β = 1 seperti gambar berikut. Jika AD = a , hitung DC

Diketahui segitiga , siku-siku di , dan  seperti gambar berikut. 

Jika , hitung  

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A. Khairunisa

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Jawaban

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 DC equals 3 straight a square root of 2.

Pembahasan

Pembahasan
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Diketahui maka dan Diketahui maka dan Didapat Untuk Jadi didapat Dengan demikian, .

Diketahui tan space straight beta equals 1 equals fraction numerator 1 straight n over denominator 1 straight n end fraction equals BC over BD

maka BC equals straight n dan BD equals straight n

Diketahui cos space straight alpha equals 4 over 5 equals fraction numerator 4 straight m over denominator 5 straight m end fraction equals AB over AC

maka AB equals 4 straight m dan AC equals 5 straight m

Didapat

table attributes columnalign right center left columnspacing 0px end attributes row BC equals cell square root of AC squared minus AB squared end root end cell row straight n equals cell square root of left parenthesis 5 straight m right parenthesis squared minus left parenthesis 4 straight m right parenthesis squared end root end cell row straight n equals cell square root of 25 straight m squared minus 16 straight m squared end root end cell row straight n equals cell square root of 9 straight m squared end root end cell row straight n equals cell 3 straight m end cell end table

Untuk

table attributes columnalign right center left columnspacing 0px end attributes row AB equals cell 4 straight m end cell row cell AD plus BD end cell equals cell 4 straight m end cell row cell straight a plus straight n end cell equals cell 4 straight m end cell row cell straight a plus 3 straight m end cell equals cell 4 straight m end cell row straight a equals cell 4 straight m minus 3 straight m end cell row straight a equals straight m end table

Jadi didapat 

table attributes columnalign right center left columnspacing 0px end attributes row DC equals cell square root of BD squared plus BC squared end root end cell row blank equals cell square root of straight n squared plus straight n squared end root end cell row blank equals cell square root of 2 straight n squared end root end cell row blank equals cell straight n square root of 2 end cell row blank equals cell 3 straight m square root of 2 end cell row blank equals cell 3 straight a square root of 2 end cell end table

Dengan demikian, DC equals 3 straight a square root of 2.

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