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Verified answer
Sisi sejajar = 28cm & Xtinggi = 16cm
luas trapesium = ½(jumlah sisi sejajar)×t
640 = ½(x+28)×16
640 = 8x + 448
640-448 = 8x
192 = 8x
x = 192/8
x = 24
jadi salah satu diagonal = 24cm
L = 640cm2
b = 28
t = 16
dit
a???
jawab
L=(a+b)t : 2
640=(a+28)16 : 2
640 = (a+ 28)8
a+28=640 : 8
a+ 28=80
a= 80-28
a=52