Question

Почему 50, а не 25??

Answer 1

$S= \frac{1}{2} *10*10 \sqrt{2} * \frac{ \sqrt{2} }{2} = \frac{10}{2} * \frac{10 \sqrt{2}* \sqrt{2} }{2} = \frac{10*10*2}{4} =50$