Question

Which biconditional statement is NOT true?

A: A triangle is equilateral if and only if it is equiangular.


B: A triangle is a right triangle if and only if the lengths of its sides are related by the equation a^2+b^2=c^2.


C: Two lines are perpendicular if and only if they intersect to form right angles.


D: A quadrilateral is a rectangle if and only if it has at least two right angles.

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Answer 1

Answer:

d

Step-by-step explanation:

quadilateral is a rectangle if all its angles are 90 degree