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t = 9m
a = 108÷9=12×2= 24.
jadi, alasnya 24 m.
dibuktikan.
L∆= ½×a×t
=½×24×9
=12×9
=108 m².
a = alas
t = tinggi = 9m
1/2 x a x 9 = 108 cm2
9/2a = 108
a = 108 x 2/9
a = 24 cm