Calculeaza aria unui romb cu perimetrul de 52cm si una din diagonale de 24cm

Răspuns :

latura=52:4=13cm
o semidiagonala 24:2=12cm
cealalta semi diagonala (diag. sunt⊥)=√(13²-12²)=5
cealata diagonala ,5*2=10
 aria =diag1*diag2/2=12*10/2=60cm²
as simple as that!!!
52:4 =  13 (  latura )
24:2 = 12 ( semidiagonal ) 
____________________  diagonalele fiind perpencidulare =) 
√(13²-12²)=√(169-144)=√25 =5
5*2 = 10 cm ( diagonala 2 ) 
Aplicam formula d1*d2/2 = (12*10)/2 = 120/2= 60 cm