What are some proofs that could be used to prove that a given rhombus is a square?
Both a rhombus and a square have equal sides, so in order to prove that a rhombus is a square ...
 If all four interior angles equal 90 degrees , the rhombus must be a square.
OR
 If the diagonals are equal , then the rhombus must be a square.
Hope that helped
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To prove that a given rhombus is a square, you can use the following proofs:

Show that all angles of the rhombus are right angles. Since a square has four right angles, if you can demonstrate that all angles in the rhombus are right angles, then it must be a square.

Prove that all sides of the rhombus are congruent. If you can show that all sides of the rhombus are equal in length, then it is a square because a square has four congruent sides.

Demonstrate that the diagonals of the rhombus are congruent and perpendicular bisectors of each other. In a square, the diagonals are not only congruent but also perpendicular bisectors of each other. If you can prove this property for the rhombus, it must be a square.
Using any of these proofs or a combination of them can establish that a given rhombus is indeed a square.
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When evaluating a onesided 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 onesided 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 onesided 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 onesided 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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 A parallelogram is determined by the vectors a = (2,5) and b = (3,2). Determined the angles between the diagonals of the parallelogram?
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