Geometry Lines and Angles
Geometric conventions: .In questions involving geometry, the conventions of plane geometry are followed, including the assumption that the sum of the measures of interior tangles of a triangles is 180 Lines are assumed to be "straight" lines that extend in both directions. When a square, circle, polygon, or other closed geometric figure is described in words but not shown, the figure is assumed to enclose a convex region. Not closed Not convex
Geometric Figures: Geometric figures consists of points, lines, line segments, curves, angles, and regions. All figures are assumed to lie in a plane unless otherwise indicated. . .If point A, B, and C does not lie on same line, then line segments AB and BC form two angles with vertex B: one angle with less than 180 and other with measure greater than 180 as shown in the figure. Less than 180 B Greater than 180 .The geometric figuics aessay uaw sac .The notation AB may mean the line segments with endpoints A and B or it may mean the length of the line segment.
Lines .A line is understood to be a straight line that extends in both directions without ending. .Given any two points on a line, a line segment is the part of the line that contains the two points and all the points between them. The two points are called end points. Line segments that have equal lengths are called congruent line segments. The point which divides a line segment into two congruent line segments is called the midpoint of the line segment .
Angles: . In plane geometry, an angle is the figure formed by two rays, called the sides of the angle sharing a common endpoint, called the vertex of the angle. .When two lines intersect at a point, they form four angles. Each angle has a vertex at the intersection of two lines. The first and third angles, that is, angles APC and BPD are called opposite angles, also known as vertical angles. .
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