# What is a rhombus with right angles?

A rhombus with right angles is a *square*.

It follows from a definition of a square as a regular 4-sided polygon.

Congruence of all sides is the property of a rhombus. This is the first necessary property of a square.

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A rhombus with right angles is called a square.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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