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Published byAmice Clark Modified over 4 years ago

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Geometry Vocabulary Introduction to Classifying Angles

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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.

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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.

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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:

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Vertex the common endpoint of an angle. (also, a corner point of a geometric figure) How do you recognize a vertex?

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Angle two rays with a common endpoint. How do you name an angle?

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Right Angle an angle that measures exactly 90° How do you identify a right angle?

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Acute Angle an angle that measures less than 90° What does it look like?

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Straight Angle an angle that measures exactly 180° What does it look like?

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Obtuse Angle an angle that measures more than 90°, AND less than 180° What two angles is an obtuse angle between?

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Adjacent Angles two angles that share a common vertex, and one side, but have no common interior points. How would you draw adjacent angles?

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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?

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Complementary Angles the sum of their measures equals 90° What kind of angle do complementary angles form?

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Supplementary Angles the sum of their measures equals 180° What kind of angle do supplementary angles form?

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Triangles & more vocabulary

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Triangle a polygon with three sides. The sum of the 3 angles equals exactly 180°.

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Congruent being exactly equal in size and shape. What can be congruent? sides angles polygon

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Scalene Triangle has NO congruent sides.

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Isosceles Triangle has at least TWO congruent sides.

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Equilateral Triangle has THREE congruent sides. Question: If the three sides are congruent, what do you think each angle measure will be? 60°

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Right Triangle a triangle with a right angle If one angle is 90°, what must be the sum of the other two angles?

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Acute Triangle a triangle with ALL three angles being acute angles.

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Obtuse Triangle A triangle with one obtuse angle. If a triangle is obtuse, what type of angles must the other two angles be?

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