What are some true statements about a 45-45-90 triangle?

Some true facts about a 45-45-90 triangle:

• It is an isosceles triangle
• It is a right triangle
• Two of these triangles together will make a square
• If the isosceles side lengths are x then the hypotenuse is x√2 (x multiplied by the square root of 2)
• The ratio of the sides are 1:1:√2