Question

Помогите даю много баллов

Answer 1

$s = frac{1}{2} times km times re times sin( alpha )$
sin45 =
$sin(45) = frac{ sqrt{2} }{2}$
$s = frac{1}{2} times 12 times 20 times frac{ { sqrt{2} } }{2} = 6 times 10 times sqrt{2} = 60 sqrt{2}$