Triangle Types

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Question Answer
Triangle A three-sided polygon (a flat shape with straight sides). A triangle has three sides and three angles The three angles always add to 180°
Equilateral Triangle A triangle with all three sides of equal length. All the angles will be 60°
Isosceles Triangle Isosceles Triangle Two equal sides Two equal angles
Right Angle Triangle A triangle where one of its interior angles is a right angle (90 degrees). Hypotenuse: The side opposite the right angle. This will always be the longest side of a right triangle. Sides: (Adjacent, Opposite) The two sides that are not the hypotenuse. They are the two sides making up the right angle itself.
Obtuse Triangle In an obtuse triangle, one angle is greater than a right angle—it is more than 90 degrees. An obtuse triangle may be isosceles or scalene.
Acute Triangle A triangle where all three internal angles are acute (less than 90 degrees).
Scalene Triangle A triangle where all three sides are different in length. No equal sides No equal angles
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