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a = 10mm
są dwa boki a, czyli 2*10mm=20mm
46mm - 20mm = 26mm
26mm : 2 = 13mm
b = 13mm
P = a*b
P = 10 * 13 = 130mm²
2a=10x2=20
2b=46-20
2b=26
b=13
p=a x b
p=10 x 13
p=130mm2