Question

Tolong dijawab yg benar-benar ya. terima kasih.

Answer 1

Verified answer

Bab Segitiga
Matematika SMP Kelas VIII

AB = √((6 - 3)² + (3 + 5)²)
      = √(3² + 8²)
      = √73
      = 8,544 cm

BC = √(5² + 3²)
      = √(25 + 9)
      = √34
      = 5,83 cm

AC = √(6² + 3²)
      = √(36 + 9)
      = √45
      = 6,7 cm

s = 1/2 x (AB + BC + AC)
   =1/2 x (8,544 + 5,83 + 6,7)
   = 1/2 x 21,074
   = 10,537 cm

Luas ΔABC = √(s x (s - AB) x (s - BC) x (s - AC))
                    = √(10,537 x (10,537 - 8,544) x (10,537 - 5,83) x (10,537 - 6,7))
                    = √(10,537 x 1,993 x 4,707 x 3,837)
                    = 19,475 cm²