Plls help
What is DE

Answer:
DE= 4.24
Step-by-step explanation:
A^2 + B^2 = C^2 Pythagorean theorem
(3)^2 + (3)^2 = C^2
9 + 9 = C^2
18 = C^2
√18 = √C^2
4.24264 = C