The properties of the angles and sides determine what type a particular triangle is. We know that there are four different types of triangles: equilateral, isosceles, scalene, and right triangles. This is a right angled isosceles triangle because it has 1 right angle and 2 equal sides marked with a dash. In this explainer, we will learn how to use the isosceles triangle theorems to find missing lengths and angles in isosceles triangles. We can use these properties to solve problems and find missing angles.Īn equilateral triangle has three equal sized side lengths and two equal sized angles.Įquilateral triangles have 3 equal sides and 3 equal angles. We can recognise right angled isosceles triangles because they have 1 right angle, 2 equal sides and 2 equal angles. An obtuse triangle has one angle that measures more than 90 and 2 acute angles. Scalene: means 'uneven' or 'odd', so no equal sides. Scalene: means 'uneven' or 'odd', so no equal sides. Isosceles: means 'equal legs', and we have two legs, right Also iSOSceles has two equal 'Sides' joined by an 'Odd' side. We can recognise right angled triangles because they have one right angle. Alphabetically they go 3, 2, none: Equilateral: 'equal' -lateral (lateral means side) so they have all equal sides Isosceles: means 'equal legs', and we have two legs, right Also i SOS celes has two equal 'S ides' joined by an ' O dd'. We can recognise scalene triangles because all the sides are different and all the angles are different. ![]() Illustrated definition of Isosceles Triangle: A triangle with two equal sides. The 2 equal angles are the base angles of the isosceles triangle. The angles opposite the equal sides are also equal. We can recognise isosceles triangles because they have 2 equal sides and 2 equal angles. Equal sides are often labelled with dashes. We can recognise equilateral triangles because they have 3 equal sides and 3 equal angles. We also need to recognise that there are lots of different types of triangles and they are all unique because of the collection of properties each shape may have. We know that all triangles have 3 sides and 3 angles. ![]() We need to know the types of triangles and their properties.
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