Right angle (geometry): Difference between revisions
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imported>Miguel Adérito Trigueira (Added diagram) |
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[[Image:Right angle (geometry) definition.png|frame|Diagram showing the definition of a right angle. The green parts are not part of the construction but show that the angles are both 90 degrees and equal to one another]] | [[Image:Right angle (geometry) definition.png|frame|Diagram showing the definition of a right angle. The green parts are not part of the construction but show that the angles are both 90 degrees and equal to one another]] | ||
In [[Euclidean geometry]] | In [[Euclidean geometry]]: | ||
A '''right angle''' (symbolised by the L shaped figure '''∟''') is an [[angle]] that the angle made between the arms of the angle is equal to the angle adjacent to it. This angle is ninety degrees. | |||
The right angle bisects the angle of the line into two equal parts. | The right angle bisects the angle of the line into two equal parts. | ||
Revision as of 07:41, 15 August 2008
_definition.png)
Diagram showing the definition of a right angle. The green parts are not part of the construction but show that the angles are both 90 degrees and equal to one another
A right angle (symbolised by the L shaped figure ∟) is an angle that the angle made between the arms of the angle is equal to the angle adjacent to it. This angle is ninety degrees.
The right angle bisects the angle of the line into two equal parts.
The right angle is demonstrated:
Given a line DC with point B lying on it Take B as the vertex of angle ABC If the angle ABC equals the angle ABD then angle ABC is a right angle, and so is angle ABD