Answer:
AB = 16
Explanation:
The perimeter is the sum of all 5 sides of the pentagon
Sum the 5 sides, equate to 69 and solve for x
12 + 3x + 10 + x + 3 + 2x + 2 = 69
6x + 27 = 69 ( subtract 27 from both sides )
6x = 42 ( divide both sides by 6 )
x = 7
AB = 2x + 2 = (2 × 7) + 2 = 14 + 2 = 16