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Diketahui segitiga PQR dengan titik-titik sudut P ( − 7 , − 3 ) , Q ( 7 , − 3 ) , dan R ( 2 , 9 ) . Tentukanlah keliling segitiga !

Diketahui segitiga dengan titik-titik sudut . Tentukanlah keliling segitiga PQR

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Z. Apriani

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

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Pembahasan

Apabilasegitiga digambarkan akan membentuk gambar sebagai berikut: Berdasarkan soal diketahuititik-titik sudut , sehingga: Maka, Jadi,keliling segitiga adalah

Apabila segitiga PQR digambarkan akan membentuk gambar sebagai berikut:

Berdasarkan soal diketahui titik-titik sudut straight P left parenthesis negative 7 comma negative 3 right parenthesis comma space straight Q left parenthesis 7 comma negative 3 right parenthesis comma space dan space straight R left parenthesis 2 comma 9 right parenthesis, sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row straight P equals cell open parentheses table row cell negative 7 end cell row cell negative 3 end cell end table close parentheses end cell row straight Q equals cell open parentheses table row 7 row cell negative 3 end cell end table close parentheses end cell row straight R equals cell open parentheses table row 2 row 9 end table close parentheses end cell end table

Maka,

table attributes columnalign right center left columnspacing 0px end attributes row cell PQ with rightwards arrow on top end cell equals cell straight q with rightwards arrow on top minus straight p with rightwards arrow on top end cell row blank equals cell open parentheses table row 7 row cell negative 3 end cell end table close parentheses minus open parentheses table row cell negative 7 end cell row cell negative 3 end cell end table close parentheses end cell row blank equals cell open parentheses table row 14 row 0 end table close parentheses end cell row cell open vertical bar PQ close vertical bar end cell equals cell square root of 14 squared end root end cell row blank equals 14 end table

table attributes columnalign right center left columnspacing 0px end attributes row cell PR with rightwards arrow on top end cell equals cell straight r with rightwards arrow on top minus straight p with rightwards arrow on top end cell row blank equals cell open parentheses table row 2 row 9 end table close parentheses minus open parentheses table row cell negative 7 end cell row cell negative 3 end cell end table close parentheses end cell row blank equals cell open parentheses table row 9 row 12 end table close parentheses end cell row cell open vertical bar PR close vertical bar end cell equals cell square root of 9 squared plus 12 squared end root end cell row blank equals cell square root of 81 plus 144 end root end cell row blank equals cell square root of 225 end cell row blank equals 15 end table

table attributes columnalign right center left columnspacing 0px end attributes row cell QR with rightwards arrow on top end cell equals cell straight r with rightwards arrow on top minus straight q with rightwards arrow on top end cell row blank equals cell open parentheses table row 2 row 9 end table close parentheses minus open parentheses table row 7 row cell negative 3 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell negative 5 end cell row 12 end table close parentheses end cell row cell open vertical bar QR close vertical bar end cell equals cell square root of open parentheses negative 5 close parentheses squared plus 12 squared end root end cell row blank equals cell square root of 25 plus 144 end root end cell row blank equals cell square root of 169 end cell row blank equals 13 end table

Jadi, keliling segitiga PQR adalah

table attributes columnalign right center left columnspacing 0px end attributes row Keliling equals cell 14 plus 15 plus 13 end cell row blank equals 42 end table

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