What is the perimeter

This Pythagorean theorem

48 feet.

Step-by-step explanation:

The Pythagorean Theorem is:

Plug in the numbers accordingly (it already gives the hypotenuse, "c."):

Subtract 256 from both sides:

Take the square root of both sides:

b = 12

To find the perimeter, add all the sides together, like so:

20 + 16 + 12 = 48

P = 48 ft

Step-by-step explanation:

Use Pythagorean theorem to find b

b = √20² - 16² = √400-256 = √ 144

b = 12

Perimeter is the sum of all sides so P = 20+16+12

P = 48

so, converting firstly the mixed fractions to improper fractions and then "adding".