Perimeter of equilateral triangles
for 5th grade
Use the formula P = 3 x length to work out the perimeter of these equilateral triangles
Calculate the perimeter of equilateral triangles
The perimeter of an equilateral triangle is the sum of the lengths of all three sides. Since all sides of an equilateral triangle are equal in length, we can find the perimeter by simply multiplying the length of one side by 3. In general, the formula for calculating the perimeter of an equilateral triangle is:
Perimeter P = 3 x L(length of one side)
For example, if the length of one side of an equilateral triangle is 5 cm, the perimeter would be:
5 cm x 3 = 15 cm
Another example, if the length of one side of an equilateral triangle is 8 inches, the perimeter would be:
8.1 cm x 3 = 24.3 cm
Notes on this topic
The perimeter of non-equilateral triangles can also be calculated by adding the lengths of each side, but these lengths may be different from each other so the formula P = 3L only applies to equilateral triangles.
Below is a table showing the first 6 question answer pairs for the topic "Perimeter of equilateral triangles" as used in the lessons for this topic. Our games and tests for the topic use these 6 items plus 10 additional question answer pairs.
The topic "Perimeter of equilateral triangles" is in the category Algebra for 5th grade (ages 10 to 11).
Revise 'Perimeter of equilateral triangles' with one of our games for 5th grade
Each of our math topics for elementary are made up of between 6 and 20 question and answer pairs (both the written form and a robot voice speaking those questions and answers). Each topic can be used with all the activities on the site.
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