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b. 9×9=81
c. 15×15=225
d. 20×20=400
itu bukan persegi panjang, karena tidak diketahui lebarnya
c.225cm² d.400cm² pertanyaan nya persegi/persegi panjang?
2. 48/4 = 12cm
Lpersegi = 12² = 144cm
3 . 64 = s²
s=√64
s= 8cm