Q: Is a triangle the only basic 3 sided shape?

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A triangle only has 3 sides, but a 10 sided shape is called a decagon

It is the only polygon whose side lengths determine its shape.

There is only one basic shape for an equilateral triangle. The area can only vary as the length of the sides vary.

No because a polygon must have 3 or more sides and the next shape after the triangle is a 4 sided quadrilateral

A triangle by definition only has 3 sides, so a 5-sided triangle does not exist - unless you are including the in-side and out-side of it as two more sides. A five sided polygon is a pentagon.

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A triangle only has 3 sides, but a 10 sided shape is called a decagon

Well, honey, when you cut a triangle in half, you get two smaller triangles. So technically, you don't get a four-sided shape, you get two three-sided shapes. It's basic geometry, darling.

An isosceles triangle.

It is the only polygon whose side lengths determine its shape.

A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!A triangle, by definition, can have only three sides. So a four sided triangle simply cannot exist!

There is only one basic shape for an equilateral triangle. The area can only vary as the length of the sides vary.

No because a polygon must have 3 or more sides and the next shape after the triangle is a 4 sided quadrilateral

If it is 19 sided it cannot be a triangle. The "tri" in the word triangle means 3. So a triangle can have only 3 sides - no more, no fewer!

A triangle by definition only has 3 sides, so a 5-sided triangle does not exist - unless you are including the in-side and out-side of it as two more sides. A five sided polygon is a pentagon.

Only if it's an equilateral triangle.

Yes

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