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20 kuadrat= j kuadrat - (8+7)kuadrat
400 = j kuadrat - 225
j kuadrat = 225 + 400
= 625
=25
2.l kuadrat= jkuadrat - (r2-r1)kuadrt
24kuadrat = j kuadrat - (7-3)kuadrat
576 = j kuadrat - (16)
j kuadrat = 576 -16
= 560
=23,6
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