Perhatikan gamabr luas segitiga ABC=

– Keliling segitiga
= s + s + s
= 10 + 6 + 8
= 24cm

– 1/2 keliling segitiga
= 1/2 x 24cm
= 12cm

• Luas segitiga ABC
= √( 12 x ( 12 – 10 ) x ( 12 – 8 ) x ( 12 – 6 ))
= √( 12 x 2 x 4 x 6 )
= √576
= 24 cm²

K = 8+6+10 = 24 cm
1/2 k = s = 12 cm

L = akar s (s-a) (s-b) (s-c)
L = akar 12. 2.4.6
L = akar 576
L = 24 cm^2