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Are the Diagonals of a Rhombus Equal?

A rhombus is a specific type of quadrilateral where all four sides are of equal length. Students often confuse the properties of a rhombus with those of a square, particularly when it comes to the length of the diagonals.

Question (Click to Flip)

What happens if the diagonals of a parallelogram are equal?

Answer

If the diagonals of a parallelogram are equal in length, then the parallelogram must be a rectangle (or a square).

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Key Facts

Every square is a rhombus, but not every rhombus is a square.

The area of a rhombus can be calculated as Area = (d1 ร— d2) / 2, where d1 and d2 are the lengths of the diagonals.

The intersection of the diagonals forms four right-angled triangles inside the rhombus.

1. Are the Diagonals Equal?

No, the diagonals of a rhombus are generally not equal in length.

While all four sides of a rhombus are strictly equal, the angles do not have to be 90 degrees. Because it is usually a 'slanted' shape, one diagonal will stretch longer across the wide angles, and the other will be shorter across the narrow angles.

2. When ARE they equal?

The diagonals of a rhombus are only equal if the rhombus is a Square. A square is a special type of rhombus where all internal angles are exactly 90 degrees.

3. Special Properties of Rhombus Diagonals

Even though they are not equal in length, the diagonals of a rhombus possess a very important property:

  • They bisect each other at exactly 90 degrees (right angles).
  • They bisect the internal angles of the rhombus.

Questions and Answers

What happens if the diagonals of a parallelogram are equal?+

If the diagonals of a parallelogram are equal in length, then the parallelogram must be a rectangle (or a square).

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