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alas = 12+8 = 20 cm
tinggi = 8 cm
Luas (L) = ...?
Peny.
L = 1/2 X alas X tinggi
L = 1/2 X 20 X 8
L = 10X8
L = 80
Maaf, kalau salah..
Semoga bermanfaat.. :) !!