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Sehingga, luasnya adalah:
Luas
= Luas segitiga besar - Luas segitiga kecil.
= 1/2 a₁t - 1/2 a₂t
= 1/2 t (a₁-a₂)
Dengan:
t = 5-(-4) = 9
a₁ = 5-(-3) = 8
a₂ = 1-(-3) = 4
Didapat:
= 1/2 x 9 (8-4)
= 1/2 x 9 x 4
= 2 x 9
= 18 satuan luas