Question

Bantuin ya soal ada di gambar

Answer 1

KL = LM - 1
LM = KM + 4
KEL Δ = 25
PANJANG KL =?
JWB : 
KEL Δ =     KL     +     LM      + KM
  25     = (LM - 1) + (KM + 4) + KM
  25     = [ (KM + 4) - 1] + KM + 4 + KM
  25     = 3 KM + 7
  25 - 7 = 3 KM
   18     = 3 KM
   18/3 = KM
    6 = KM
LM = KM + 4
      = 6 + 4 = 10
KL = LM - 1
      = 10 - 1 = 9

Answer 2

KL= LM-1
= (4+x)-1
= 3+x cm

KM = x cm

LM = 4+x cm

maka:

K = 25
KL+LM+KM = 25
3+x+4+x+x = 25
7+3x = 25
3x = 25-7
3x = 18
x = 18/3
x = 6 cm

jadi, KL = 3+x
= 3+6 = 9 cm (C)