quadrilateral is a polygon with four right angles and four side with the same length.
polygon with four right angles and four side with the same length?
quadrilateral
closely related and important geometrical concepts are perpendicular lines, meaning lines that form right angles at their point of intersection, and orthogonality, which is the property of forming right angles, usually applied to vectors. the presence of a right angle in a triangle is the defining factor for right triangles, making the right angle basic to trigonometry.





















































section::::in elementary geometry.





















































a rectangle is a quadrilateral with four right angles. a square has four right angles, in addition to equal-length sides.





















































the pythagorean theorem states how to determine when a triangle is a right triangle.





















































section::::symbols.
right angle
four right exertions





















































the four right exertions (also known as, four proper exertions, four right efforts, four great efforts, four right endeavors or four right strivings) (pali: '; skt.: ' or "") are an integral part of the buddhist path to enlightenment. built on the insightful recognition of the arising and non-arising of various mental qualities over time and of our ability to mindfully intervene in these ephemeral qualities, the four right exertions encourage the relinquishment of harmful mental qualities and the nurturing of beneficial mental qualities.
four right exertions