Which statement is true?

a
Pythagorean Theorem states that the area of the 3 squares add to be the right triangle's area
b
Pythagorean Theorem states three squares can always be put together to form a right triangle in the middle.
c
Pythagorean Theorem states that all three squares have 4 right angles.
d
Pythagorean Theorem states that the area of the purple square + the area of the blue square = the area of the red square
e
Pythagorean Theorem states that the area of the blue square + the area of the red square = the area of the purple square.

E. Pythagorean Theorem states that the area of the blue square + the area of the red square = the area of the purple square.