The figure below shows an equilateral triangle example.Īn isosceles triangle is a triangle that has two interior angles of equal measure and therefore two sides of equal length. The figure below shows a right triangle example.Īn equilateral triangle is a triangle in which all the sides and interior angles have the same measure (60°). The remaining two angles are acute angles. The figure below shows an obtuse triangle example.Ī right triangle is a triangle that has one interior angle that measures 90°. Since the sum of the interior angles of a triangle must be equal to 180°, the remaining two angles of an obtuse triangle are acute angles that sum to a value that is less than 90°. The figure below shows an acute triangle example.Īn obtuse triangle is a triangle in which one of the interior angles measures between 90° and 180°. Acute triangleĪn acute triangle is a triangle in which all of the interior angles measure less than 90°. Triangles can be further classified as equilateral, isosceles, or scalene. The figure below shows a right triangle and the symbol denoting the 90° angle:Īny triangle can classified as either acute, obtuse, or right. If the angle is a right angle, rather than using an arc, the symbol ⌞ is used instead. If there are the same number of tallies or arcs, the sides or angles involved are congruent. The higher the number of tally marks or arcs, the larger the side or angle respectively. The measure of a triangle's sides and angles relative to each other can be indicated using tally marks and arcs. Thus, the three interior angles for △ABC above are A, B, and C. These angles share the same name as their vertices. Referencing the above triangles, an interior angle is formed at each vertex of a triangle. In the triangle above, the lower case letters are the sides and the upper case letters are their opposing angles. Triangle sides can also be labeled based on its opposing angle: The sides of the triangle above are named using the line segments between vertices: AB, BC, and AC. One way that triangles are named is by labeling their vertices using either lower case or upper case letters, as shown in the figure below: Various notation are used to label triangles.
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