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Always
Sometimes
Never

2007-08-27 09:17:06 · 12 answers · asked by Anonymous in Science & Mathematics Mathematics

12 answers

sometimes

- always as a square and rectangle
- never as a rhombus or any even-numbered polygon.

so, sometimes they have 90 degree angles

2007-08-27 09:31:57 · answer #1 · answered by Dani 2 · 0 0

Not necessarily. A parallelogram with four right angles is called a rectangle or square. Generally, a parallelogram has four sides where the opposing sides of the quadrilateral are parallel to each other. The angles would be acute and obtuse, two of each. Thus you have a quadrilateral being any figure with four sides. When those sides are parallel, it becomes a parallelogram. When those sides are connected with right angles, it becomes a rectangle and when the sides are of equal length, it becomes a square.

2016-05-19 03:36:47 · answer #2 · answered by ? 3 · 0 0

sometimes

Squares and Rectangles are parallelograms with four right angles.

A Rhombus is a parallelogram with 2 acute and 2 obtuse angles.

2007-08-27 09:21:23 · answer #3 · answered by JL 3 · 1 0

Nope, not necessarily. A parallelogram must have four sides joined at four angles with each set of opposite sides being parallel in euclidean Geometry.

2007-08-27 09:25:42 · answer #4 · answered by Spicemon 2 · 0 1

sometimes.

a rectangle is a parallelogram and has 4 right angles, but a parellelogram does not have to have right angles. it just requires that the opposite sides are parallel to each other.

2007-08-27 09:21:17 · answer #5 · answered by Anonymous · 1 0

Never

Only a square or rectangle has 4 right angles.
A right angle is 90 degrees.

Parallelograms look like they have been squashed.

Check the images I found on Google.

2007-08-27 09:28:31 · answer #6 · answered by barefoot1957 2 · 0 1

sometimes.

a square and a rectangle have four right angels, but a rhombus does not. all three of these are parallelograms.

2007-08-31 09:20:10 · answer #7 · answered by Merlyn 7 · 0 0

Sometimes, when it is a rectangle or square. Option 2. ANS

2007-08-27 09:22:36 · answer #8 · answered by Anonymous · 0 0

Sometimes

2007-08-27 09:20:39 · answer #9 · answered by Lady Geologist 7 · 1 0

sometimes - but then it is a rectangle.

2007-08-27 09:21:30 · answer #10 · answered by Anonymous · 0 1

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