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Nilai n
5n + 5 = 7n - 1
5n - 7n = -5 - 1
-2n = -6
n = 3
Maka panjangnya = 5n + 5 = 5 x 3 + 5 = 20 cm
Lebarnya = 4n + 3 = 4 x 3 +3 = 15 cm
Kelilingnya = 2 x 20 + 2 x 15
= 40 + 30
= 70 cm
No. 11
Tinggi jajargenjang = 5² - 3² = 25 - 9 = √16 = 4 cm
L = 7 x 4 = 21 cm²
No. 12
Keliling = 2(AB + luas/BF)
= 2(36 + 288/18)
= 2(36 + 16)
= 2(52)
= 104 cm
Maaf jika ada kesalahan