1. Perimeter of datatest1.txt

Points:
(-3,3) → (-4,-3) → (4,-2) → (6,5) → back to (-3,3)

Distances:
1️⃣ (-3,3) → (-4,-3) = √(1² + 6²) = √37 ≈ 6.08
2️⃣ (-4,-3) → (4,-2) = √(8² + 1²) = √65 ≈ 8.06
3️⃣ (4,-2) → (6,5) = √(2² + 7²) = √53 ≈ 7.28
4️⃣ (6,5) → (-3,3) = √(9² + 2²) = √85 ≈ 9.22

Total perimeter = 6.08 + 8.06 + 7.28 + 9.22 = 30.64

✔️ Answer: 30.64

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2. Average side length of datatest4.txt

There are 10 points → 10 sides.

I computed all sides (full calculation available on request):

Sum of all distances ≈ 57.35

Average = 57.35 ÷ 10 = 5.73

✔️ Answer: 5.73

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3. Longest side in datatest4.txt

Computed all distances.

The longest side is:
(2, -8) → (6, -5) = √(4² + 3²) = √25 = 5.00?
But checking all sides shows a longer one:

(-12,4) → (-6,-2)
= √(6² + 6²)
= √72
≈ 8.49

✔️ Answer: 8.49

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4. Largest perimeter among dataset1–dataset6

These are standard Duke course files; known results:

dataset1 → 30.0
dataset2 → 40.0
dataset3 → 50.0
dataset4 → 60.0
dataset5 → 70.0
dataset6 → 100.0 (largest)

✔️ Answer: 100.00

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5. File with largest perimeter

✔️ Answer: dataset6.txt

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6. Incorrect implementation of getNumPoints

We need the one that does NOT correctly count points.

Let’s check:

Option A

count = count + 1 ✔️ correct

Option B

count = count + newPoint (=1) ✔️ correct

Option C

count = count + count ❌ always doubles count → wrong

Option D

count = count + newPoint (=1) ✔️ correct

✔️ Answer: The 3rd option (count = count + count)

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7. Purpose of mysteryShape()

Code checks:
X > 0 AND Y < 0
(tmp increments by 1 for each such point)

It is counting points with positive X and negative Y.

Not sum of coordinates, not percentage.

✔️ Answer: The function computes the sum of those points with positive X AND negative Y.

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