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2 bok - 4x
pole P = 3x * 4x = 12x²
P =108 cm²
12x² = 108
x² = 9
x = 3
boki mają 9 cm i 12 cm
przekatna d:
d² = 9² + 12²
d² = 81 + 144
d² = 225
d = 15 cm
obwód:
L = 2 * 9 + 2 * 12 = 18 + 24 = 42 cm