Simple curve- a curve that does not cross itself.
Closed curve- a curve that starts and stops at the same point.
Polygon- a simple, closed curve with sides that are line segments.
Convex- simple, closed curve, such that the segment connecting any two points in the interior of the curve is wholly contained in the interior of the curve.
Concave curve- simple, closed curve that is not convex. It is possible for a line segment connecting two interior points to cross outside the interior of the curve.
Interior angles- angle formed by two sides of a polygon with a common vertex
Exterior angles- an angle formed by a side of a polygon and the extension of a contiguous side of the polygon
Triangles
Angles- sum equals 180
Right triangle- contains one right angle
Acute triangle- triangle in which all angles are acute (smaller than 90
)Obtuse triangle- a triangle containing one obtuse (bigger than 90
) angleSides
Scalene triangle- triangle with no congruent sides
Isosceles triangle- triangle with at least two congruent sides
Equilateral triangle- a triangle with three congruent sides
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