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2 . rumus :
x= (2p/l - 1 ) s
x= lebar bagian bawah
s = lebar bagian kiri,kana, atas
jawab:
x= ( 2 x 30/20 -1)2
x =( 30/10-1)2
x= (3-1)2
x= (2)2
x= 4
jadi , luas karton bagian bawah adalah 4 cm
= 5√5
lebar bgn bawah = 30 - 24 - 2 = 4 cm