Presentation on theme: "Geometry Vocabulary Introduction to Classifying Angles."— Presentation transcript:
Geometry Vocabulary Introduction to Classifying Angles
Line a straight path that connects two points, but extends past both points, forever. to identify a line, select two points, and draw the symbol of a line over it. A line ALWAYS has arrows at both ends.
Segment two points and all the points in a straight path between them to identify a segment, select two endpoints, and draw the symbol of a segment over it. A segment DOES NOT have arrows at the ends.
Ray an endpoint and all the points in a straight path in one direction to identify a ray, start with an endpoint, then use another point in the direction you want. For example, point G going to point B would be:
Vertex the common endpoint of an angle. (also, a corner point of a geometric figure) How do you recognize a vertex?
Angle two rays with a common endpoint. How do you name an angle?
Right Angle an angle that measures exactly 90° How do you identify a right angle?
Acute Angle an angle that measures less than 90° What does it look like?
Straight Angle an angle that measures exactly 180° What does it look like?
Obtuse Angle an angle that measures more than 90°, AND less than 180° What two angles is an obtuse angle between?
Adjacent Angles two angles that share a common vertex, and one side, but have no common interior points. How would you draw adjacent angles?
Vertical Angles when 2 lines intersect, they form 4 angles. The angles across from each other are called, ‘vertical angles.’ What do vertical angles look like?
Complementary Angles the sum of their measures equals 90° What kind of angle do complementary angles form?
Supplementary Angles the sum of their measures equals 180° What kind of angle do supplementary angles form?