Names of triangles: Properties of scalene, isosceles and equilateral triangles.
There are basically three types of triangles that you need to remember for your maths exams, these are scalene, isosceles and equilateral triangles.
The scalene triangle is probably the least interesting of the three triangles. A scalene triangle has three different side lengths and three different angles.
An isosceles triangle is one which has two equal side lengths and two equal angles. It also has one line of reflectional symmetry. A typical maths question on isosceles triangles will be to work out the missing angles inside the isosceles triangle if already given one of the angles.
Work out the missing angles in this isosceles triangle.
First of all take the angle you are given from 180⁰ as the angles in a triangle add up to 180⁰.
180 – 16 = 164⁰.
Once this is done, all you need to do now is half this answer as the two angles at the bottom of the triangle are the same size (because the triangle is isosceles).
Therefore, if you halve 164 you get answer of 82⁰.
So the two angles at the bottom of the triangle are 82⁰.
An equilateral triangle has three equal side lengths and three equal angles. Since all the angles in a triangle add up to 180⁰ and an equilateral triangle has 3 equal sides, then the interior angles can be found by dividing 180 by 3. This gives the interior angle of an equilateral triangle of 60⁰. Also an equilateral triangle has 3 lines of reflectional symmetry and order 3 rotational symmetry.
More by this Author
The density, mass and volume triangle is as follows: So if you wanted to work out the density, you would cover up density in the magic triangle to give: Density = Mass/Volume (since mass is above volume) So if...
The surface area of a triangular prism can be found in the same way as any other type of prism. All you need to do is calculate the total area of all of the faces. A triangular prism has 5 faces, 3 being rectangular and...
A compound shape is a shape that is made up from other simple shapes. In this article we will be working out the area of a L shape (made up from 2 rectangles). To find the area of a compound shape, follow these simple...