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68 = 2 × (23 + l)
68 = 46 + 2l
2l = 68 - 46
2l = 22
l = 22/2
l = 11
Luas persegi panjang :
= p × l
= 23 × 11
= 253 cm² (B)
68 = 2 × (23 + l)
68 = 46 + 2l
2l = 68 - 46
2l = 22
l = 22/2
l = 11
b. Luas persegi panjang :
= p × l
= 23 × 11
= 253 cm²