Plz help I'll mark brainliest Definition: A phrase in a word problem that tells you to subtract.

Example: 18 - 2 can be written as "The of 18 and 2"

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square