The profit a hot dog vendor earned, in dollars, is proportianl to the number of hot dogs sold. this equation represents teh proportion relationship between the profit earned (p) andthe number of hot dogs (h) is sold.

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