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p = 2x
q = 3x
r = 4x
K = p + q + r
45 = 2x + 3x + 4x
45 = 9x
5 = x
Panjang PR = r
= 4x
= 4(5)
= 20 cm
Jadi panjang PR adalah 20 cm.
perbandingn p : q : r = 2 : 3 : 4
K = 45 cm
fktor pengali = x
maka :
K = sisi (1+2+3)
45 = 2x + 3x + 4x
45 = 9x
x = 45/9
x = 5 cm
jdi pnjang sisi :
PQ = 2 x5 = 10 cm
QR = 3 x 5 = 15 cm
PR = 4 x 5 = 20 cm