BE = 12 cm BA 20 cm EF = A = 12 cm b = 16 cm c = 24 cm d 28 cm

p BA=p BF

EF = akar (20 kuadrat - 12 kuadrat)
= akar(400 - 144)
=akar(256)
= 16
maaf kalau salah soalnya gambarnya gak jelas