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it is not because then it wouldn't be a square.A square equals 4 90 degree angles and 4 equal sides.

Q: If the first three angles of a square are right how is the fourth wrong?

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No, if a trapezium had three right angles, it would mean the fourth angle would have to be 90 degrees. That would make it a square or a rectangle.

square has 4 right angles and triangle has no right angles

A rectangle has four right angles but is not a square.

A square has four right angles.

no, a square has 4 right angles

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The sum of all four angles is 360 degrees. If three of the angles were right angles then the fourth would have to be a right angle. You would then have a rectangle or a square, but not a trapezium.

No, if a trapezium had three right angles, it would mean the fourth angle would have to be 90 degrees. That would make it a square or a rectangle.

No. If you take the first four equal lengthed sides of the shape separated by three right angles the end of the fourth would touch the start of the first forming a square. The fifth side could not exist.

First you draw a square. A square has 4 right angles. If you draw a line above one of the right angles and rub out the angle which you have drawn a line above you have a pentagon with 3 right angles.

A square with 4 right angles and has a point of a triangle on the end of the square

A square has 4 right angles.

a square has 4 right angles.

There are four (4) right angles in a square.

A square, by definition, must have four right angles. A plane shape with 4 right angles which is not a square is a rectangle.

what is a quadrangle that has 4 right angles and is not a square!

square has 4 right angles and triangle has no right angles

A rectangle has four right angles but is not a square.