Which biconditional statement is NOT true?
A triangle is equilateral if and only if it is equiangular.
A triangle is a right triangle if and only if the lengths of its sides are related by the equation a² + b² = c².
Two lines are perpendicular if and only if they intersect to form right angles.
A quadrilateral is a rectangle if and only if it has at least two right angles.
Which biconditional statement is NOT true? A triangle is equilateral if and only if it is equiangular. A triangle is a right triangle if and only if the lengths of its sides are related by the equation a² + b² = c². Two lines are perpendicular if and only if they intersect to form right angles. A quadrilateral is a rectangle if and only if it has at least two right angles
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The statement that is NOT true is:
A quadrilateral is a rectangle if and only if it has at least two right angles.
Explanation: A quadrilateral can have two right angles and still not be a rectangle. For example, a right kite has two right angles but is not a rectangle. A rectangle must have all four angles as right angles (90 degrees) for it to meet the definition.