Question

va rog daca puteti sa ma ajutati,va dau funda

Answer 1

1.
P=2L+2l=84 => L+l=42
l=20L/100=L/5
L + L/5 = 42
5L+L=210
6L=210 => L=35
l=L/5 => l=7

2.
P=2L+2l=2(L+l)
L=30P/100=3P/10
P=2(3P/10 + l)
P=3P/5 + 2l
5P=3P+10l
10l=2P => l=2P/10=P/5
l/L=P/5:3P/10=P/5 • 10/3P
l/L=2/3

3.
a) AM-mediana în ▲dr. => BC=2AM=5 cm
b) P=4+5+5=14 cm
c)BS=AC și CS=AB (def. dreptunghi)
P=2•4+2•5=18 cm