![]() In a right triangle, one of the angles is a right angle-an angle of 90 degrees. An equiangular triangle is a kind of acute triangle, and is always equilateral. In an equiangular triangle, all the angles are equal-each one measures 60 degrees. A scalene triangle may be right, obtuse, or acute (see below). In a scalene triangle, none of the sides are the same length. ![]() An isosceles triangle may be right, obtuse, or acute (see below). In an isosceles triangle, two sides are the same length. An equilateral triangle is always equiangular (see below). In an equilateral triangle, all three sides are the same length. Or, it may be classified by what kind of angles it has. A triangle may be classified by how many of its sides are of equal length. In an isosceles triangle, the two equal sides are called legs, and the remaining side is called the base.A triangle has three sides and is made of straight lines. If all three side lengths are equal, the triangle is also equilateral. What are the characteristics of an isosceles triangle?Īn isosceles triangle is a triangle that has (at least) two equal side lengths. However other texts define an isosceles triangle as having at least two equal sides,… Some texts use a definition that state an isosceles triangle has exactly two equal sides, and under that definition the answer is an isosceles triangle can never have three angles congruent. Acute angles are always less than 90°, so B is also true.ĭoes isosceles triangle have three congruent sides? It also has two angles which are the same, and one angle which is different, so D is true. What is true about an isosceles triangle?Īn isosceles triangle has two sides which have the same length, and one side with a different length, so A is true. The difference between these two definitions is that the modern version makes equilateral triangles (with three equal sides) a special case of isosceles triangles. What is special about an isosceles triangle?Įuclid defined an isosceles triangle as a triangle with exactly two equal sides, but modern treatments prefer to define isosceles triangles as having at least two equal sides. It is also sometimes called a septagon, though this usage mixes a Latin prefix sept- (derived from septua-, meaning “seven”) with the Greek suffix -gon (from gonia, meaning “angle”), and is therefore not recommended. What do you call a polygon with seven sides?Ī heptagon is a seven-sided polygon. A Quadrilateral has four-sides, it is 2-dimensional (a flat shape), closed (the lines join up), and has straight sides….The Trapezoid (UK: Trapezium) Since it is a right triangle, the angle between the two legs would be 90 degrees, and the legs would obviously be perpendicular to each other. Is an isosceles a right triangle?Īn Isosceles Right Triangle is a right triangle that consists of two equal length legs. The word has also developed a somewhat controversial sense of “hard to comprehend,” probably as a result of confusion with abstruse. Obtuse, which comes to us from the Latin word obtusus, meaning “dull” or “blunt,” can describe an angle that is not acute or a person who is mentally “dull” or slow of mind. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case. In geometry, an isosceles triangle is a triangle that has two sides of equal length. ![]() One example of isosceles acute triangle angles is 50°, 50°, and 80°. What are the angles of a acute isosceles triangle?Īn isosceles acute triangle is a triangle in which all three angles are less than 90 degrees and at least two of its angles are equal in measurement. Obtuse angles measure more than 90 degrees. It will always have angles of 60° in each corner.Īcute angles measure less than 90 degrees. An equilateral triangle has three equal sides and angles. What is a triangle with 3 equal sides?Įquilateral. Ī triangle that has two sides of equal length and two equal angles.Īn isosceles obtuse triangle is a triangle in which one of the three angles is obtuse (lies between 90 degrees and 180 degrees) and the other two acute angles are equal in measurement. By definition, an acute isosceles triangle will have at least two sides (and at least two corresponding angles) that are congruent, and no angle will be greater than. ![]()
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