All the angles can be equal (equilateral), two sides (isosceles) can be the same, and no sides (scalene) can equal. The angles that are present in triangles help us determine the classification. When it comes to angles were are looking at the types of angles (acute, obtuse, right) that exist in the figure and if there are any congruent angles in the structure. We also compare edges and see if they are congruent meaning that they are equal in every way. We look to see if the edges form right angles and as a result have perpendicular sides. When looking at the lines we try to determine if they are parallel meaning are always the same distance from one another and will never touch. After we consider the number of sides, we focus our attention to properties of these lines and the angles that they create. These are the figures that we work with the most often in geometry and architecture, so it is important to understand how to classify these figures. There are a great number of different types of triangles and quadrilateral. We use a Greek prefix to name shapes based on their shape 3 edges = tri- (triangle), 4 edges = quad- (quadrilateral: square, rectangle, rhombus), 5 edges = penta- (pentagon), 6 edges = hex- (hexagon), 7 edges = hepta- (heptagon), 8 edges = octa- (octagon). When it comes to edges, we first classify them by the number of sides that they possess. There are several different properties that we can they are related to the sides or angles of the figure. Two-dimensional figures or shapes only have two measures of length (height and width) associated with them.
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