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Anggap saja [ABC] itu adalah 1/2 jajargenjang
Sehingga,
[ABC] = 1/2 at
= 1/2 AB x CD atau dengan 1/2 AC x BE
Yang ada:
[ABC] = 1/2 x AC x BE
Nomor 17.
L = 84
Dan,
a = 12
Sehingga,
L = 1/2 at
84 = 1/2 x 12 x t
84 = 6t
t = 84/6
t = 14 cm