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b=4x
2×3x+2×4x=42cm
6x+8x=42
14x=42
x=42:14
x=3
boki prpostokąta:
a=3x=3×3=9cm
b=4x=4×3=12cm
d²=a²+b²
d²=9²+12²
d²=81+144
d=√225
d=15cm
przekątna ma 15cm