Q. Can the sides of a triangle have lengths 1, 4, and 5?Choices:(A) yes(B) no
Triangle Inequality Theorem: To determine if these can be the sides of a triangle, we need to check the triangle inequality theorem. This theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
Check 1 + 4 > 5: Check if 1 + 4 > 5. Calculation: 1+4=5. Since 5 is not greater than 5, the inequality does not hold.