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AE/FB=(AB-DC):2
=(40-20):2 *di bagi 2 biar sama antr AE dg FB
= 10cm
t/DE/CF= *akar AD kuadrat-AE kuadrat
= *akar 276-100= 24cm
L trap (a+b):2xt
(20+40):2x24=....cm2
kel trap tgl ditambh semua sisiny aj, 20+40+26+26=.....
titik2 nya km jwb sndr ya, bisa sharing lg kl msh ad ksushan