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B= 3x+3
C= 4x-3
keliling segitiga = A + B + C
56 = x + 3x+3 + 4x-3
56 = 8x
56:8 = x
7 = x
sisi A = x
= 7 cm
sisi B = 3x+3
= 3(7)+3
= 24 cm
sisi C= 4x-3
= 4(7)-3
= 25 cm
Luas segitiga
=1/2· A·B
=1/2 · 7 · 24
=1/2 ·168
=84 cm