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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
Odp. Pole tego prostokąta wynosi 130mm².
a=10
2a=20
46-20=26
26/2=13
b=13
P=a * b
P= 10 * 13
P=130mm
a=10mm
b=x
obw.=46mm
p.=a*b
p.=x
2(10+x)=46
20+2x=46
2x=46-20
2x=26 /:2
x=13
p=13*10=130mm²