S треугольника = a + b + c
S = 60см
a = 3x
b = 5x
c = 7x
a = 3 × 4 = 12см - маленькая сторона
b = 5 × 4 = 20см
c = 7 × 4 = 28см - большая сторона
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S треугольника = a + b + c
S = 60см
a = 3x
b = 5x
c = 7x
a = 3 × 4 = 12см - маленькая сторона
b = 5 × 4 = 20см
c = 7 × 4 = 28см - большая сторона