Luas segitiga abc dengan panjang sisi a=6cm b=8cm c=12cm

L= 1/2xaxt
= 1/2x6x8
= 24 cm2

6 = alas
8 = tinggi

L = 1/2.a.t
= 1/2.6.8
= 1/2.48
= 48/2
= 24 cm²