Diketahui segitiga KLM dng panjang KL: 6cm LM: 5 cm dan KM: 4cm . Luas segitiga KLM adalah...

Luas segitiga KLM
KL =m=  6
LM= k = 5
KM= l = 4

s = 1/2 keliling = 1/2 (6+5+4)= 7,5 cm
Luas= √[ s (s-k)(s-m)(s-l)
Luas= √ [(7,5) (2,5)(1,5)(3,5]
L = √(75/10)(25/10)(15/10)(35/10)
L = 1/100 √(75 x 25 x 15 x 35)
L = 1/100 √(3 x 25 x 25x 3 x 5 x 5 x 7)
L = 1/100 √ (3²x 25² x5² x 7)
L = (3x 25x 5)/100 √7
L = 375/100 √7
L = 3 ³/₄ √7 cm²