A triangle with one curved side is called a curvilinear triangle. This type of triangle has one side that is not straight, but instead follows a curved path. Curvilinear triangles are not as common or well-known as traditional triangles with straight sides, but they still adhere to the fundamental properties of triangles, such as having three sides and three angles that add up to 180 degrees.
An arc (segment of a circle) has one straight side, and one curved side.
That would be called a right triangle!
A triangle with 2 equal side lengths is called an isosceles triangle.
Perpendicular bisector.
No. Angles don't have anything called a side length. However, one can use trigonometry to compute the angles of a triangle based on the side lengths of the triangle (triangles do have side lengths).
Oh, dude, you're hitting me with the tricky questions! Technically, a three-sided shape that's not a triangle is called a "trigon." It's like the rebellious cousin of the triangle that doesn't play by the rules. So yeah, it exists, but it's not really stealing the spotlight from the classic triangle, you know what I mean?
An arc (segment of a circle) has one straight side, and one curved side.
In a right triangle (a triangle where one of the angles is exactly 90 degrees) , the longest side is called the hypotenuse. In non-right triangles, the longest side has no special name.
That would be called a right triangle!
A triangle with 2 equal side lengths is called an isosceles triangle.
A triangle has three sides. The two sides that are perpendicular are called legs and the diagonal side is called the hypotenuse. Whichever side is horizontal (usually one of the legs) is also called the base.
Perpendicular bisector.
The point where the lines which connect one vertex of the triangle and the middle of the opposite side intersect.
No. Angles don't have anything called a side length. However, one can use trigonometry to compute the angles of a triangle based on the side lengths of the triangle (triangles do have side lengths).
circle
If you see something that looks like that, it might be a sector of a circle. But it might not be. One thing's for sure: It's no triangle.
The sides of triangles do not have set names, except in the case of the right triangle (where one side opposite the right angle is called the hypotenuse). They are usually labelled arbitrarily a, b and c.