Final answer:
To find the total length of fence required to secure the perimeter of Shannon's garden, add up the lengths of all the sides of the garden and then subtract the length of the gate.
Step-by-step explanation:
To find the total length of fence required to secure the perimeter of Shannon's garden, you need to add up the lengths of all the sides of the garden, and then subtract the length of the gate. Let's say the sides of the garden are A, B, C, and D (where D is the length of the side with the gate). The total length of fence required is A + B + C + D, minus the width of the gate.
For example, if the sides A, B, and C are each 10 feet long, and the gate is 3 feet wide, then the total length of fence required would be 10 + 10 + 10 + (10 - 3) = 37 feet.