Do the lengths of 10,4 and 5 form a triangle explain why please I’m confused

no

Explanation:

Imagine having sticks of these lengths. Attach the 4 and 5 to both ends of the 10. No way you can have them touch each other, not even when the triangle is flat.

The 4 and 5 add up to 9, that is less than 10.

The Triangle Inequality Theorem states that the sum of any 2 sides of a triangle must be greater than the measure of the third side.

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