Răspuns:
1.
a) P = 4* l , deci l = P : 4
l = 36 : 4 = 6 (cm)
b) d = [tex]\sqrt{l^{2}+ l^{2} } = \sqrt{l^{2}*2 } =l\sqrt{2} = 6\sqrt{2}[/tex] (cm)
c) A = l * l = 6 * 6 = 36 ([tex]cm^{2}[/tex])
2.
a) d = [tex]l\sqrt{2}[/tex]
l = d : [tex]\sqrt{2} = 7 \sqrt{2} : \sqrt{2} = 7[/tex] (cm)
b) P = l * 4 = 7 * 4 = 28 (cm)
c) A = l * l = 7 * 7 = 49 ([tex]cm^{2}[/tex])
3.
[tex]d^{2} = L^{2} + l^{2} \\6^{2} =5^{2} + l^{2} \\l^{2} =36-25=11\\l=\sqrt{11}[/tex]
Explicație pas cu pas:
