Question

Помощь ...............

Answer 1

$23.\ d^{2}=a^{2}+b^{2}+c^{2}\ ;a=b=c\\d^{2}=3a^{2}\\a= \sqrt{ \frac{d^{2} }{3} }\\a= \sqrt{12}=2 \sqrt{3}\\\\24.\ S= \frac{Posn.(Apof.)}{2}\\S= \frac{12(4\sqrt{3)}}{2}\\S=24 \sqrt{3}$