Postulates are the axioms which define space, these axioms cannot be proved. Suffice to say it is true because that is part of the definition of space.
I hope this answers your question.
-Petroz
PostulatesEuclid's 4th postulate states that all right angles are congruent. This postulate holds in all non-euclidean geometries as well. So regardless of the geometry (elliptic/Euclidean/hyperbolic) of the figure, if both are right angles then they are most definitely congruent.Postulates are the axioms which define space, these axioms cannot be proved. Suffice to say it is true because that is part of the definition of space.
I hope this answers your question.
-Petroz
PostulatesEuclid's 4th postulate states that all right angles are congruent. This postulate holds in all non-euclidean geometries as well. So regardless of the geometry (elliptic/Euclidean/hyperbolic) of the figure, if both are right angles then they are most definitely congruent.Postulates are the axioms which define space, these axioms cannot be proved. Suffice to say it is true because that is part of the definition of space.
I hope this answers your question.
-Petroz
PostulatesEuclid's 4th postulate states that all right angles are congruent. This postulate holds in all non-euclidean geometries as well. So regardless of the geometry (elliptic/Euclidean/hyperbolic) of the figure, if both are right angles then they are most definitely congruent.Postulates are the axioms which define space, these axioms cannot be proved. Suffice to say it is true because that is part of the definition of space.
I hope this answers your question.
-Petroz
PostulatesEuclid's 4th postulate states that all right angles are congruent. This postulate holds in all non-euclidean geometries as well. So regardless of the geometry (elliptic/Euclidean/hyperbolic) of the figure, if both are right angles then they are most definitely congruent.Postulates are the axioms which define space, these axioms cannot be proved. Suffice to say it is true because that is part of the definition of space.
I hope this answers your question.
-Petroz
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A square because that is the only possible figure that can have two congruent sides and four right angles.
A quadrilateral with 4 right angles cannot have just two congruent sides so, unless this is a trick question (2 congruent sides does not excluded the possibility of more than 2 congruent sides), the answer is there is no such plane figure.
It could be any number of polygons with 4 or more sides.
rectangle
No, An equilateral triangle has 3 congruent angles, an isosceles triangle has 2 congruent angles, a scalene triangle has no congruent angles.