AB^2 + BC^2 = AC^2
AB^2 + 6^2 = square root 117^2
AB^2 + 36 = 117
Now subtract 117 from both sides
AB^2 = 81
AB = square root 81 = 9

Therefore AB is 9 cms.
259% increase because 6 x 2 is 12 and 3 is the remainder and 3/6 is 50%
16 students turned in their homework early i think. I hope this helps