Problema 1:
L=16cm
d=32cm
L²+l²=d²
16²+l²=32²
l²=32²-16²
l²=(32-16)(32+16)
l²=16*48
l=16*rad(3)
A=l*L=16rad3*16=256rad3 cm²
Problema 2:
l=10cm
P=32cm
A=?
P=2l+b (l=latura egala, b baza)
P=20+b=32
b=12cm
A (heron)=rad((p-a)(p-b)(p-c))=rad(16-12)(16-10)(16-10))
A=rad(4*6²)=2*6=12cm²
Problema 3:
P=52cm
d=24cm
P=4l=52cm
l=13cm (latura rombului)
(dm/2)²+(d/2)²=l² (dm diagonala mica, d diag mare)
(dm/2)²+12²=13²
(dm/2)²=(13-12)(13+12)
(dm/2)²=25
dm/2=5
dm=10cm
A=dm*d/2=10*13/2=5*13=65cm²
Problema 4 nu am cum sa o rezolv
Problema 5
b=4m
B=10m
alfa=45*
mvopsea=2kg
Arie/masa=1m²/80g
daca alfa=45*, atunci h=B-b
A=(B+b)h/2=14*6/2=42m²
Arie/masa*mvopsea=2000/80=25m² vopsea
25m²<42m² (Nu avem destula vopsea)
