What does l m a o means give full explanation-

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)