other side is 4, hypotenuse is 5
180 degrees
88
No, they cannot.
never
yes
Yes
A isosceles triangle
I am trying to find out too but if your stuck at 3:07 to 3:40 he folds down a trianlge the DOESN'T unfold an fold it again.
The sum of the angles in a triangle is 180 degrees.
8
It could be an isosceles triangle or a scalene triangle.