Pengenalan & Jenis-jenis Segitiga

Dalam kehidupan sehari-hari, kita sering menjumpai hal-hal yang berbentuk segitiga, seperti dibawah ini

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Apa sebenarnya ciri-ciri dari segitiga? dan bagaimana sebenarnya segitiga itu?

Pada tulisan saya kali ini, saya akan membahas mengenai segitiga

Ciri-ciri Segitiga

  • Segitiga merupakan bangun datar
  • Terdiri dari 3 sisi/ruas garis
  • Terdiri dari 3 sudut

Tapi, bagaimana segitiga itu dapat dibentuk?

Segitiga dapat dibentuk jika

  • Jumlah panjang dua sisi segitiga lebih panjang dari sisi lainnya
  • Selisih panjang dua sisi segitiga kurang dari sisi lainnya

  • a + b > c, a + c > b, b + c > a
  • a – b < c, a – c < b, b – c < a

Jadi, tidak semua garis dapat memebentuk segitiga yah readers.

Contoh:

Jika terdapat panjang sisi-sisi yaitu 2 cm, 6 cm, dan 10 cm.

Apakah panjang sisi-sisi tersebut dapat membentuk segitiga ?

Jawabannya adalah tidak

Karna 2 + 6 = 8 < 10

Readers bisa mencoba untuk membentuk segitiga jika panjang garis tersebut adalah 2, 6, dan 10 cm (kalau bisa πŸ™‚ )

Adapula informasi yang perludiketahui mengenai segitiga, yaitu

  • Sisi terpanjang akan saling berhadapan dengan sudut terbesar
  • Sisi terpendek akan saling berhadapan dengan sudut terkecil

Pengertian Segitiga

Segitiga adalah bangun datar yang memiliki 3 ruas garis, 3 sudut, dan jumlah sudutnya adalah 180^0.

Jenis-jenis Segitiga

Ditinjau dari Panjang Sisinya

Segitiga Sama Sisi

Segitiga yang ketiga sisinya sama panjang. Akibatnya, setiap sudut dari segitiga sama sisi juga sama besar, yaitu \frac {180^0}{3}=60^0

Segitiga Sama Kaki

Segitiga yang dua sisinya sama panjang. Akibatnya, terdapat 2 sudut yang sama besar.

Segitiga Sembarang

Segitiga yang ketiga sisinya tidak sama panjang. Akibatnya, tidak ada sudut yang sama besar.

Ditinjau dari Besar Sudutnya

Segitiga Siku-siku

Segitiga yang salah satu sudutnya 90^0

Segitiga Lancip

Segitiga yang ketiga sudutnya <90^0

Segitiga Tumpul

Segitiga yang salah satu sudutnya >90^0

Inilah pengenalan dari segitiga

Mudah-mudahan bermanfaat πŸ™‚

Wassalam

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