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sisi sejajar = 9cm dan 21 cm
luas = ?
K = jlh seluruh sisi
50 = 9 + 21 + 2sisi miring
50 = 30 + 2sisimiring
20 = 2sisi miring
sisi miring = 10
selisih sisi sejajar = 21-9 = 12
12 : 2 = 6cm
tinggi = √10²-6²
= √100-36
= √64 = 8cm
Luas = 1/2 x (jlh sisi sejajar) x t
= 1/2 x 30 x 8
= 120 cm²
Maaf kalo slh ^_^