L= 1/2 a . t
28 = 1/2 . 4 . t
28 = 2 . t
t = 28/2
t= 14 cm
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Verified answer
L= 1/2 a . t
28 = 1/2 . 4 . t
28 = 2 . t
t = 28/2
t= 14 cm
28cm²=4×t:2
28:4=t:2
7=t:2
7×2=t
14=t
jadi tingginya 14 cm
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