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a. 6 x 4 = 24 cm²
b. 12 x 10 = 120 cm²
2. Panjang = Luas / lebar = 150 / 10 = 15 cm
5. s = keliling / 4 = 48 / 4 = 12 cm.
Luas = s² = 12² = 144 cm²
6. s = √Luas = √64 = 8
Jadi panjang sisinya adalah 8 cm.
7. Luas persegi = s² = 8² = 64 cm².
Panjang persegi panjang = Luas / lebar = 64 / 4 = 16 cm.
8. Luas persegi panjang ABCD = panjang x lebar = 10 x 6 = 60 cm²
Luas ΔABC = luas segitiga = 1/2 x alas x tinggi = 1/2 x 10 x 6 = 30 cm²