tolong di jawab, besok mau ulangan

jawab :
a = 2
b = 4 - 2 = 2

un = a + ( n - 1 ) b
u12 = 2 + ( 12 - 1 ) 2
= 2 + 11.2
= 2 + 22 = 24

banyak persegi = 2 × 24 = 48 ( B )


semoga membantu.....