Given an equilateral triangle:
What is its perimeter?
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Given an equilateral triangle:
What is its perimeter?
Since the triangle is equilateral, that is, all sides are equal to each other.
The perimeter of the triangle is equal to the sum of all sides together, the perimeter of the triangle in the drawing is equal to:
15
Is the triangle in the drawing a right triangle?
Equilateral means all sides have the same length. So if one side is 5 units, then all three sides are 5 units each.
Yes! Since all sides are equal, you can multiply the side length by 3. For this triangle: units.
The answer 5 is just one side, not the whole perimeter. The answer 10 would only be two sides. You need all three sides for the complete perimeter.
For any triangle, you still add all three side lengths. The difference is that non-equilateral triangles have different side lengths, so you can't use the multiplication shortcut.
Think of walking around the shape! Perimeter is the total distance you'd walk if you traced around the outside edges of the triangle.
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