In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. Another name is equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 ...
A rational number is a number that can be expressed as a fraction or ratio. The numerator and the denominator of the fraction are both integers.When the fraction is divided out, it becomes ...
An angle is the union of two rays with a common endpoint, called the vertex. The angles formed by vertical and horizontal lines are called right angles; lines, segments, or rays that intersect in ...