Question

Ofer toate coroanele

Answer 1

Răspuns:

1.

a) P = 4* l , deci l = P : 4

  l = 36 : 4 = 6 (cm)

b) d = $\sqrt{l^{2}+ l^{2} } = \sqrt{l^{2}*2 } =l\sqrt{2} = 6\sqrt{2}$ (cm)

c) A = l * l = 6 * 6 = 36 ($cm^{2}$)

2.

a) d = $l\sqrt{2}$

  l = d : $\sqrt{2} = 7 \sqrt{2} : \sqrt{2} = 7$ (cm)

b) P = l * 4 = 7 * 4 = 28 (cm)

c) A = l * l = 7 * 7 = 49 ($cm^{2}$)

3.

$d^{2} = L^{2} + l^{2} \\6^{2} =5^{2} + l^{2} \\l^{2} =36-25=11\\l=\sqrt{11}$

Explicație pas cu pas: