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r=15-2=13cm
Pp-pole pierścienia
Pp= πR² - πr²
Pp=π (15cm)² - π(13cm)²
Pp= π225cm² - 169cm²
Pp= 56πcm²
Pk- pole koła (całego arbuza)
Pk- πR²
Pk=225πcm²
225πcm² -56πcm²= 169πcm²
π=3,1
169 × 3,1= 523,9cm²
Odp: miąższ stanowi 523,9cm² arbuza