Sure, here is a Python solution for the problem:

```python
def classify_triangle(a, b, c):
# Check if triangle can be formed
if a + b c and a + c b and b + c a:
# Check for equilateral triangle
if a == b == c:
return "Equilateral triangle"
# Check for isosceles triangle
elif a == b or b == c or c == a:
return "Isosceles triangle"
# If not equilateral or isosceles, it must be scalene
else:
return "Scalene triangle"
else:
return "Error"

# Test cases
print(classify_triangle(4, 4, 4)) # Output: Equilateral triangle
print(classify_triangle(5, 7, 10)) # Output: Scalene triangle
print(classify_triangle(2, 4, 9)) # Output: Error
print(classify_triangle(5, 7, 5)) # Output: Isosceles triangle
```

This Python function takes the lengths of the three sides of a triangle as input and first checks if a triangle can be formed with these lengths. If it can, it then checks if the triangle is equilateral, isosceles, or scalene, and returns the appropriate classification. If a triangle cannot be formed with the given lengths, it returns "Error".

Question

Sure, here is a Python solution for the problem:

```python
def classify_triangle(a, b, c):
    # Check if triangle can be formed
    if a + b > c and a + c > b and b + c > a:
        # Check for equilateral triangle
        if a == b == c:
            return "Equilateral triangle"
        # Check for isosceles triangle
        elif a == b or b == c or c == a:
            return "Isosceles triangle"
        # If not equilateral or isosceles, it must be scalene
        else:
            return "Scalene triangle"
    else:
        return "Error"

# Test cases
print(classify_triangle(4, 4, 4))  # Output: Equilateral triangle
print(classify_triangle(5, 7, 10))  # Output: Scalene triangle
print(classify_triangle(2, 4, 9))  # Output: Error
print(classify_triangle(5, 7, 5))  # Output: Isosceles triangle
```

This Python function takes the lengths of the three sides of a triangle as input and first checks if a triangle can be formed with these lengths. If it can, it then checks if the triangle is equilateral, isosceles, or scalene, and returns the appropriate classification. If a triangle cannot be formed with the given lengths, it returns "Error".

Knowee AI · Accepted Answer

Sure, here is a Python solution for the problem:

```python
def classify_triangle(a, b, c):
    # Check if triangle can be formed
    if a + b > c and a + c > b and b + c > a:
        # Check for equilateral triangle
        if a == b == c:
            return "Equilateral triangle"
        # Check for isosceles triangle
        elif a == b or b == c or c == a:
            return "Isosceles triangle"
        # If not equilateral or isosceles, it must be scalene
        else:
            return "Scalene triangle"
    else:
        return "Error"

# Test cases
print(classify_triangle(4, 4, 4))  # Output: Equilateral triangle
print(classify_triangle(5, 7, 10))  # Output: Scalene triangle
print(classify_triangle(2, 4, 9))  # Output: Error
print(classify_triangle(5, 7, 5))  # Output: Isosceles triangle
```

This Python function takes the lengths of the three sides of a triangle as input and first checks if a triangle can be formed with these lengths. If it can, it then checks if the triangle is equilateral, isosceles, or scalene, and returns the appropriate classification. If a triangle cannot be formed with the given lengths, it returns "Error".

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