# Equilateral Triangle Definition

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We know triangle is a polygon with three sides. With the measurement of sides of a triangle, we classified the triangles into three kinds. In that equilateral triangle is one of those three triangles. We can define equilateral triangle is triangle with three equals sides. We know the sum of the angles in a triangle is 180o. In other word, we can define equilateral triangle is a kind of triangle with equal angles which are all equals to 60o

Example 1: In an equilateral triangle, find the height of the triangle with length of the side 10 cm.

Solution:  From the problem, we can write

Length of the side = a = 10 cm

We have a formula to find the height of the triangle that is

Example 2: In an equilateral triangle, find the height of the triangle with length of the side 30 cm.

Solution:  From the problem, we can write

Length of the side = a = 30 cm

We have a formula to find the height of the triangle that is