I need help :( If you are not sure please say so because if I get it wrong it sets me back about an hour. I am also throwing 40 point out.

I need help If you are not sure please say so because if I get it wrong it sets me back about an hour I am also throwing 40 point out class=

Respuesta :

The cosine of an angle in an isosceles right triangle is always √(2) / 2.