Answer:
16.3 feet
Step-by-step explanation:
find the value of the missing side using the pythagorean theorem -
[tex]a^{2} + b^{2} = c^{2}[/tex] -> [tex]3^{2} +a^{2} =7^{2}[/tex] -> 9 + [tex]a^{2}[/tex] = 49 -> [tex]a^{2}[/tex] = 40 -> take the square root of both sides: [tex]\sqrt{a} = \sqrt{40}[/tex] -> a = 6.3
then you add it with the other two sides to get the perimeter: 6.3 + 3 + 7 = 16.3
