basic definitions in geometry

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Basic Definitions in Geometry

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Basic Definitions in Geometry. Acute Angle. An angle that measures between 0 and 90 degrees. Right Angle. Angle that measures 90 degrees and formed by perpendicular lines. Obtuse Angle. An angle that measures between 90 and 180 degrees. Straight Angle. - PowerPoint PPT Presentation

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Page 1: Basic Definitions in Geometry

Basic Definitions in Geometry

Page 2: Basic Definitions in Geometry

Acute Angle

• An angle that measures between 0 and 90 degrees.

Page 3: Basic Definitions in Geometry

Right Angle

• Angle that measures 90 degrees and formed by perpendicular lines.

Page 4: Basic Definitions in Geometry

Obtuse Angle

• An angle that measures between 90 and 180 degrees.

Page 5: Basic Definitions in Geometry

Straight Angle

• An angle that measures 180 degrees.

Page 6: Basic Definitions in Geometry

Reflex Angle

• An angle that measures between 180 and 360 degrees.

Page 7: Basic Definitions in Geometry

Complementary Angle

• Two angles that add up to 90 degrees.

Page 8: Basic Definitions in Geometry

Supplementary Angles

• Two angles that add up to 180 degrees.

Page 9: Basic Definitions in Geometry

Equilateral Triangle

• A triangle that has 3 equal sides.

Page 10: Basic Definitions in Geometry

Equiangular Triangle

• A triangle that has 3 equal angles and each measures 60 degrees (sum is 180).

Page 11: Basic Definitions in Geometry

Scalene Triangle

• Triangle with different sides and angles.

Page 12: Basic Definitions in Geometry

Isosceles Triangle

• A triangle that has two equal sides and two equal base angles.

Page 13: Basic Definitions in Geometry

Vertical Angles

• Two angles in which the sides of one angle are opposite rays to the sides of the second angle.

Page 14: Basic Definitions in Geometry

Adjacent Angles

• Two angles having a common vertex and a common side, but do not have any interior points in common.

Page 15: Basic Definitions in Geometry

Line Segment

• 2 points called endpoints and all of the points in between them.

Page 16: Basic Definitions in Geometry

Ray

• A part of a line that consists of a point on the line, called the endpoint, and all of the points on one side of the line.

Page 17: Basic Definitions in Geometry

Opposite Rays

• Two rays of the same line with a common endpoint and no other points in common.

Page 18: Basic Definitions in Geometry

Collinear

• A set of points all lying on the same straight line.

Page 19: Basic Definitions in Geometry

Midpoint

• The point of a line segment that divides it into 2 congruent (equal) parts.

Page 20: Basic Definitions in Geometry

Bisector

• A line, ray, or segment which divides a segment into 2 congruent parts.

Page 21: Basic Definitions in Geometry

Perpendicular Lines

• Two lines that intersect to form right angles.

Page 22: Basic Definitions in Geometry

Altitude

• The perpendicular segment from a vertex of a polygon to the opposite side.

Page 23: Basic Definitions in Geometry

Median

• A segment that joins any vertex of a triangle to the midpoint of the opposite side.