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2 -12 -13 Angle and Triangle Vocabulary

2 -12 -13 Angle and Triangle Vocabulary Essential Questions: Where is geometry seen in the real world? What professions use geometry? How are triangles used in architecture? Art? Other places?. BOP: What geometry term might you associate with each object ? 1. one edge of a cardboard box

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2 -12 -13 Angle and Triangle Vocabulary

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  1. 2-12-13 Angle and Triangle Vocabulary Essential Questions: Where is geometry seen in the real world? What professions use geometry? How are triangles used in architecture? Art? Other places? BOP: What geometry term might you associate with each object? 1.one edge of a cardboard box line segment or line 2. the floor plane or rectangle 3. the tip of a pen point DWP: What is the measure of the smaller angle between the hour hand and the minute hand on a clock at eight o’clock? 120 degrees

  2. What do you remember about geometry? Check geometry pre-assessment.

  3. Part 2: Use the figure at the right To answer the following questions.

  4. Vocabulary Activity Part 1 - Word Sort Sort the words into different categories. Part 2 - Definition Match Match the words and the definitions. Complete Vocabulary Note Sheet Part 3 - Whole Group Review Add facts and picture representations to complete the vocabulary notes.

  5. RAY A ray is a part of a line. It has exactly one endpoint. Name its endpoint first.

  6. ANGLE A figure formed by two rays with a common endpoint.

  7. VERTEX A vertex is the point where two sides intersect.

  8. SIDE The side of an angle is one of the rays forming the exterior of the angle or a polygon.

  9. RIGHT ANGLE An angle that measures 90 degrees.

  10. ACUTE ANGLE An angle that measures less than 90 degrees

  11. OBTUSE ANGLE An angle that measures greater than 90 degrees but less than 180 degrees.

  12. STRAIGHT ANGLE An angle that measures 180 degrees.

  13. COMPLEMENTARY ANGLES If the sum of the measures of two angles is 90 degrees, the angles are complementary.

  14. SUPPLEMENTARY ANGLES If the sum of the measures of two angles is 180 degrees, the angles are supplementary.

  15. CONGRUENT ANGLES Angles that have the same measure are congruent angles.

  16. ADJACENT ANGLES Adjacent angles share a vertex and a side but no points in their interiors.

  17. VERTICAL ANGLES Vertical angles are formed by two intersecting lines and are opposite each other. Vertical angles are congruent.

  18. TRIANGLE A triangle is a three sided polygon.

  19. EQUILATERAL TRIANGLE A triangle with three congruent sides.

  20. ISOSCELES TRIANGLE A triangle with two congruent sides.

  21. SCALENE TRIANGLE A scalene triangle is a triangle with no congruent sides.

  22. RIGHT TRIANGLE A triangle containing a right angle.

  23. ACUTE TRIANGLE A triangle with all angles measuring less than 90 degrees.

  24. OBTUSE TRIANGLE A triangle containing one obtuse angle.

  25. 7-2 Angles The measure of XYZ is 122°, or m XYZ = 122°. Course 2 Angles are measured in degrees (°). You can use a protractor to measure an angle.

  26. 7-2 Angles STV m STV = 55° A. XTU B. m XTU = 25° Course 2 Additional Example 1A & 1B: Identifying Angle Measures Give the measurement of each angle.

  27. HOW TO USE A PROTRACTOR http://www.youtube.com/watch?v=FeclDm7pVcI

  28. Homework: Finish Vocabulary words; Study for quiz on Thursday. Review handout

  29. Summary: Answer today’s essential questions in three or four sentences. Homework: Finish Vocabulary Definitions and quiz on Friday

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