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Diketahui segitiga PQR dengan PQ = 2 3 ​ , QR = 1 dan PR = 7. ​ Jika ∠ Q = θ , tentukan θ !

Diketahui segitiga PQR dengan , tentukan 

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N. Puspita

Master Teacher

Jawaban terverifikasi

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nilai .

nilai straight theta equals 30 degree.

Pembahasan

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Diketahui : Ditanya : Tentukan nilai Penyelesaian Jadi, nilai .

Diketahui :

table attributes columnalign right center left columnspacing 0px end attributes row PQ equals cell straight r equals 2 square root of 3 end cell row QR equals cell straight p equals 1 end cell row PR equals cell 1 equals square root of 7 end cell row cell angle straight Q end cell equals straight theta end table

Ditanya :

Tentukan nilai theta

Penyelesaian 

table attributes columnalign right center left columnspacing 0px end attributes row cell straight q squared end cell equals cell straight p squared plus straight r squared minus 2 open parentheses straight p close parentheses open parentheses straight r close parentheses open parentheses cosθ close parentheses end cell row cell open parentheses square root of 7 close parentheses squared end cell equals cell 1 squared plus open parentheses 2 square root of 3 close parentheses squared minus 2 open parentheses 1 close parentheses open parentheses 2 square root of 3 close parentheses cos space straight theta end cell row 7 equals cell 1 plus 12 minus 4 square root of 3 cos space straight theta end cell row cell 4 square root of 3 cos space straight theta end cell equals cell 13 minus 7 end cell row cell 4 square root of 3 cosθ end cell equals 6 row cell cos space straight theta end cell equals cell fraction numerator 6 over denominator 4 square root of 3 end fraction straight x fraction numerator square root of 3 over denominator square root of 3 end fraction end cell row cell cos space straight theta end cell equals cell fraction numerator 6 square root of 3 over denominator 4 cross times 3 end fraction end cell row cell cos space straight theta end cell equals cell 1 half square root of 3 end cell row straight theta equals cell 30 degree end cell end table

Jadi, nilai straight theta equals 30 degree.

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