Tolong bantu jawab beserta caranya(yang dilingkari)

Luas Jajargenjang = panjang alas x tinggi

1
a) L = 5cm x 12cm  = 60 cm²
b) L = 14 cm x 23 cm = 322 cm²
c) L = 25 cm x 7 cm = 175 cm²
d) L = 13cm x 24 cm = 312 cm²

2.  panjang alas = a
tinggi  = t = 2 kali alas = 2a
Luas = 162
L  = a x t
162 = a x 2a
2a² = 162
a² = 162/2 = 81
a = √81
a = 9
t = 2a = 2x 9 = 18 cm
panjang alas = 9 cm
tingginya = 18 cm