Question

Tolong dijawab serta caranya

Answer 1

46. keliling = 10 + 10 + 7 = 27 cm
47. PR = 2/3 x 18 = 12 cm, QR = 5/6 x 12 = 10 cm
keliling = 18 + 12 + 10 = 40 cm
48. 5x + 4x + 3x = 84
12x = 84
x = 7
AB = 4x = 4x7 = 28 cm

Answer 2

46. AB + AC + BC = 10 + 10 + 7 = 27cm (a)

47. PQ = 18cm
      PR = 2/3PQ
             2/3 x 18
             12cm
      QR = 5/6PR
               5/6 x 12
               10cm
      Kllng = PQ + PR + QR = 18 + 12 + 10 = 40cm (c)

47. a = BC         b = AB         c = AC
     perbandingan sisinya = 5 : 3 : 4
     Keliling = a + b + c
     84 = 5x + 3x + 4x
     84 = 12x
       x = 7
     panjang a = 5x = 5(7) = 35cm
     panjang b = 3x = 3(7) = 21cm
     panjang c = 4x = 4(7) = 28cm
     panjang b adalah panjang  AB
     jadi panjang AB adalah 21cm (d)