Below is an equilateral triangle:
If the perimeter of the triangle is 33 cm, then what is the value of X?
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Below is an equilateral triangle:
If the perimeter of the triangle is 33 cm, then what is the value of X?
We know that in an equilateral triangle all sides are equal.
Therefore, if we know that one side is equal to X, then all sides are equal to X.
We know that the perimeter of the triangle is 33.
The perimeter of the triangle is equal to the sum of the sides together.
We replace the data:
We divide the two sections by 3:
11
In a right triangle, the side opposite the right angle is called....?
That's the definition of equilateral! The prefix 'equi-' means equal, and 'lateral' means sides. So an equilateral triangle has three equal sides by definition.
Equilateral: all 3 sides equal
Isosceles: only 2 sides equal
Scalene: all 3 sides different lengths
Then you'd need to know the individual lengths of each side to find the perimeter. With equilateral triangles, knowing one side tells you everything!
Yes! For any regular polygon (equal sides), use: Perimeter = (number of sides) × (side length). For example, a square: P = 4s.
Sometimes you'll get a decimal or fraction for the side length. That's perfectly normal! Just make sure your calculation is accurate.
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