acute scalene triangle: all sides have different lengths.Īs you see, once we understand what an acute triangle is, it's obvious how to decide if a triangle is acute if you know its angles: just take a look at these angles and make sure they are all strictly less than 90° (π/2 rad).acute isosceles triangle: two sides are equal and.acute equilateral triangle: all three sides are equal.Obtuse triangle: has an obtuse angle (and two acute angles).Īcute triangles can be further divided into three categories, based on the side lengths (more precisely, on side length ratio):.Right triangle: has a right angle (and two acute angles) and If you know the special property of a triangle, use an equilateral triangle, isosceles or right triangle calculator.Acute triangle: all three of its angles are acute.Obtuse angle: it measures more than 90˚ and less than 180˚.īased on that, we distinguish three types of triangles: What Type of Angle Triangles can also have names that tell you what type of angle is inside: Combining the Names Sometimes a triangle will have two names, for example: Right Isosceles Triangle Has a right angle (90), and also two equal angles Can you guess what the equal angles are Play With It. ![]()
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