Question

exercitiul 6 va rog si daca se poate ex 5

Answer 1

5.

$c_1^2+c_2^2= ip(d)^2$

$c_1^2+ 5^2= 13^2$

$c_1^2+25= 169$

$c_1^2= 169 - 25$

$c_1^2= 144$

$c_1= \sqrt{144}$

$c_1(l)= 12 cm$

$p = 2(L+l)= 2(12\cdot5 )= 2\cdot 60 = 120 \ cm$

6.

$\frac{3\cdot1\ + 4 \cdot3 + 5 \cdot4 + 6 \cdot4 + 7\cdot5 + 8\cdot 3 + 9 \cdot2 + 10 \cdot3}{1+3+4+4+5+3+2+3} =\frac{166}{25} = 6.64$