Which biconditional statement is NOT true?
A triangle is equilateral if and only if it is equiangular.
Two lines are perpendicular if and only if they intersect to form right angles.
A triangle is a right triangle if and only if the lengths of its sides are related by the equation a² + b² = c².
A quadrilateral is a rectangle if and only if it has at least two right angles.
Which biconditional statement is NOT true?
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The biconditional statement that is NOT true is:
A quadrilateral is a rectangle if and only if it has at least two right angles.
Explanation: A rectangle must have four right angles, not just two. Therefore, having only two right angles does not guarantee that a quadrilateral is a rectangle, making this statement false. The other statements are true, as they accurately define the relationships described. If you have more questions or need further clarification, feel free to ask!