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Pertanyaan

Pada gambar di bawah ini, ∠ RPQ = ∠ PSQ = 90° . Besar ∠ PQS = 60° dan ∠ PTQ = 45° . Jika , maka ... cm.

Pada gambar di bawah ini, RPQ = ∠PSQ = 90°. Besar PQS = 60° dan PTQ = 45°. Jika begin mathsize 14px style open vertical bar RS close vertical bar equals 2 end style, maka begin mathsize 14px style open vertical bar TQ close vertical bar equals end style ... cm.

 

  1. begin mathsize 14px style fraction numerator 4 over denominator 3 square root of 2 end fraction end style 

  2. begin mathsize 14px style fraction numerator 4 over denominator 2 square root of 2 end fraction end style 

  3. begin mathsize 14px style fraction numerator 3 over denominator 2 square root of 2 end fraction end style 

  4. begin mathsize 14px style fraction numerator 2 over denominator 3 square root of 2 end fraction end style 

  5. begin mathsize 14px style fraction numerator 2 over denominator 2 square root of 3 end fraction end style 

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah A.

jawaban yang tepat adalah A.

Pembahasan

Diketahui . Besar dan , maka didapat besar sudut berikut ini. Dengan aturan sinus, maka kita peroleh perhitungan berikut ini. Jadi, jawaban yang tepat adalah A.

Diketahui begin mathsize 14px style angle RPQ equals angle PSQ equals 90 degree end style. Besar begin mathsize 14px style angle PQS equals 60 degree end style dan begin mathsize 14px style angle PTQ equals 45 degree end style, maka didapat besar sudut berikut ini.

begin mathsize 14px style angle SPQ equals angle PSQ minus sign angle PQS equals 90 degree minus sign 60 degree equals 30 degree angle SPR equals angle PSR minus sign angle PRS equals 90 degree minus sign 30 degree equals 60 degree angle PRS equals angle PSR minus sign angle SPR equals 90 degree minus sign 60 degree equals 30 degree angle SQT equals angle TSQ minus sign angle PTQ equals 90 degree minus sign 45 degree equals 45 degree end style  

 

Dengan aturan sinus, maka kita peroleh perhitungan berikut ini.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator PS over denominator sin invisible function application straight angle PRS end fraction end cell equals cell fraction numerator RS over denominator sin invisible function application straight angle SPR end fraction end cell row cell fraction numerator PS over denominator sin invisible function application 30 degree end fraction end cell equals cell fraction numerator 2 over denominator sin invisible function application 60 degree end fraction end cell row cell fraction numerator PS over denominator 1 half end fraction end cell equals cell fraction numerator 2 over denominator 1 half square root of 3 end fraction end cell row PS equals cell fraction numerator 2 over denominator square root of 3 end fraction end cell row blank blank blank row blank blank blank row cell fraction numerator SQ over denominator sin invisible function application straight angle SPQ end fraction end cell equals cell fraction numerator PS over denominator sin invisible function application straight angle SQP end fraction end cell row cell fraction numerator SQ over denominator sin invisible function application 30 degree end fraction end cell equals cell fraction numerator fraction numerator 2 over denominator square root of 3 end fraction over denominator sin invisible function application 60 degree end fraction end cell row cell fraction numerator SQ over denominator 1 half end fraction end cell equals cell fraction numerator fraction numerator 2 over denominator square root of 3 end fraction over denominator 1 half square root of 3 end fraction end cell row SQ equals cell fraction numerator fraction numerator 2 over denominator square root of 3 end fraction over denominator 1 half square root of 3 end fraction left parenthesis 1 half right parenthesis end cell row blank equals cell 2 over 3 end cell row blank blank blank row blank blank blank row cell fraction numerator TQ over denominator sin invisible function application straight angle TSQ end fraction end cell equals cell fraction numerator SQ over denominator sin invisible function application straight angle STQ end fraction end cell row cell fraction numerator TQ over denominator sin invisible function application 90 degree end fraction end cell equals cell fraction numerator 2 over denominator sin invisible function application 45 degree end fraction end cell row cell TQ over 1 end cell equals cell fraction numerator 2 over 3 over denominator 1 half square root of 2 end fraction end cell row cell TQ over 1 end cell equals cell 2 over 3 times fraction numerator 2 over denominator square root of 2 end fraction end cell row TQ equals cell fraction numerator 4 over denominator 3 square root of 2 end fraction end cell end table end style

Jadi, jawaban yang tepat adalah A.

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