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Keliling = 63
sisi 1 + sisi 2 + sisi 3 = 63
4x + 3x + 2x = 63
9x = 63
x = 63 : 9
x = 7
Maka:
Panjang sisi 1 = 4x = 4 . 7 = 28 cm
sisi 2 = 3x = 3 . 7 = 21 cm
sisi 3 = 2x = 2 . 7 = 14 cm
b = 3
c = 2
a = a/(a+b+c) × 63
= 4/(4+3+2) × 63
= 4/9 × 63
= 4 × 7
= 28 cm
b = 3/9 × 63
= 21 cm
c = 2/9 × 63
= 14 cm