Question

Qual o valor de a? Por favor me ajudemm

Answer 1

a) Diagonal do quadrado 

d = $\sqrt {l^{2} + l^{2}}$

a = $\sqrt {(8)^{2} + (8)^{2}}$
a = $\sqrt {64+64}$
a = $\sqrt {168}$
a = $\sqrt {2.64}$
a = 8 $\sqrt {2}$

b) altura
$h = \dfrac {l}{2} . \sqrt{3}$

$a =\dfrac {12}{2} . \sqrt{3}$
$a = 6 . \sqrt{3}$

c) altura
$h = \dfrac {l}{2} . \sqrt{3}$
$\dfrac {a}{2} . \sqrt{3} =5\sqrt{3}$
$a . \sqrt {3} = 10\sqrt{3}$
a = 10

d) Diagonal
$d =\sqrt {l^{2}+l^{2}$
$\sqrt {a^{2}+a^{2}$ =$7\sqrt{2}$
$\sqrt {2a^{2}$ =$7\sqrt{2}$
// eleva os dois lados ao quadrado
$2a^{2} = 49.2$
$a^{2} = 49$
$a =\sqrt{49}$
a = 7