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L trapesium= 168 cm2
DC= 15 cm
AB= 27 cm
kita cari tinghinya dulu
L trapesium= a + b * t / 2
168 = 15 + 37 *t / 2
168 = 42 *t / 2
168 = 21 *t
t = 168 / 21
t = 8 cm
EB = 27 - 15 / 2
= 12 / 2
= 6
AD = 10 (pakek rumus pitagiras aja, sorry aku lupa)