What’s the answer to this?!

Answer: The perimeter of the shape rounded to the nearest tenth is 20
Brainliest would be nice
Step-by-step explanation:
Answer:
19.1
Step-by-step explanation:
Pythagorean theorem: a^2+b^2=c^2
4^2+7^2=c^2
16+49=c^2
C^2=65
c=hypotenuse =root 65
Perimeter =7+4+root65=19.1ft