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Jawab:
4 cm
Penjelasan dengan langkah-langkah:
L1 = 81 cm²
L2 = 25 cm²
Luas persegi = s²
L1 = s1²
81 = s1²
√81 = s1
9 = s1
s1 = 9 cm
L2 = s2²
25 = s2²
√25 = s2
5 = s2
s2 = 5
Selisih panjang sisi = s1 - s2
= 9-5
= 4 cm
