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s = (28 - 6 - 12) : 2
= 10 : 2
= 5
a = ( 12-6) : 2
= 6 : 2
= 3
tinggi trapesium adalah
luas = (a+b) x t : 2
= (12+6) x 4/2
= 18 x 2
= 36 cm²
jawabnnya 36 cm²
cari sisi miringnya ( kaki trapesiumnya)
keliling trapesium = jumlah sisi sejajar + 2 sisi miring
28 = 6 + 12 + 2a
28 - 6 - 12 = 2a
10 = 2a
a = 5
tinggi trapesium =
= 4
jadi luas trapesium = ( jumlah sisi sejajar)/ 2 x t
= ( 6 + 12)/2 x 4
= 36