0.1608 to the nearest cent smart ones

21/2 hours=150 minutes150 minutes x 80 beats per minute= 12,000 beats in 2 1/2 hours

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