- A3
- B2
- C4
- D1
Step-by-Step Solution
List sides a ≤ b ≤ c with a + b + c = 9 and a + b > c: (1, 4, 4), (2, 3, 4), (3, 3, 3). Sets like (1, 3, 5) or (2, 2, 5) fail. So 3 triangles.
Answer: A) 3
How many different triangles with whole-number sides (in cm) have a perimeter of 9 cm?
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