segi tiga ABC dengan panjang Sisi AB=4 cm, BC=6cm,AC=8cm.nilai tg

S = 1/2 (a + b + c)
s = 1/2 (4 + 6 + 8)
s = 1/2. 18
S = 9

Tc = 2 √s(s - a) (s - b) (s - c)/c
Tc = 2 √9(9-4)(9-6)(9-8)/8
Tc = 2 √135/8
Tc = 2.9√15/8
Tc = 2 1/4 √15