Question

1:Calculati aria unui triunghi ABC de inaltime AD,stiind ca:
a)BC =4 cm; AD = 6 cm; b)BC = 20 mm; AD = 0.3 dm;

c)AD = 40 cm; BC = 3 AD; d)BC = 10 cm; AD = 20%BC
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5

Answer 1

A=b*h/2 A- arie , b-baza triunghiului , h - inaltimea . A.Transforma 20 mm in cm si 0,3dm in cm Dupa calculeaza A=BC*AD/2B. 20% din 3 inseamna 20/100*3 A=bc*ad/2

Answer 2

a) A= (b·h)/2= (4·6):2=24:2=12cm²
b)0.3dm=3cm si 20mm=2cm =>A= (3·2):2=6:2=3cm²
c) BC=3·40=120=> A= (120·40):2= 4800:2= 2400cm²
d) AD= 20/100·10=2cm=>A= (10·2):2=> A= 20:2= 10 cm²