Page 11 - MODUL TRIGONOMETRI

L  11 , 27
3. Hitung luas segitiga ABC, jika diketahui a = 3 cm, b = 4 cm, c = 5 cm.
Jawab :
s = ½ (a + b + c) = ½ (3 + 4 + 5) = 6
L  s .(s  a ).(s  b ).(s  ) c
L  6 .( 6  3 ).( 6  4 ).( 6  ) 5

L  1 . 2 . 3 . 6
L  36  6 cm 2

11