No. A triangle is a closed shape made of three straight lines, joined at their endpoints forming three vertices and three angles (hence tri-angle).
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Yes, a shape can have three straight sides and one curved side. This type of shape is known as a triangle with one curved side, which is also called a curved triangle or a curved-sided triangle. The curved side can be a segment of a circle or any other curved shape, while the other three sides are straight lines.
The shape that has 1 curved side and 3 straight sides is a crescent. A crescent is a curved, closed shape that resembles a thin, partially illuminated moon. It is formed by the intersection of two circles or by removing a smaller circle from a larger one, resulting in one curved side and three straight sides.
This side is called the hypotenuse.
The longest side of a triangle is called the Hypotenuse.
Side c of a triangle is opposite angle C