angle degree ( ) intersecting endpoint line line of symmetry line GH or GH Lesson 14 3 Lesson 14 4 Lesson 14 1 Lesson 14 2 Lesson 14 8 Lesson 14 10

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1 Vocab Lesson 14 8 acute angle acute triangle B A Lesson 14 3 C angle degree ( ) 120 Lesson 14 2 Siede Preis/Photodisc/Getty Images endpoint intersecting 0 line line GH or GH line of symmetry G H

2 Ideas for Use A triangle that has three acute angles. Does a triangle contain line segments? Explain. The unit used to measure an angle. Degree has more than one meaning. Write a definition for a different meaning of the word. Lines that meet or cross each other. The Latin root sect means cut. How can this help you remember the term intersecting? Develop categories for the words. Sort them by category. Ask another student to guess each category. An angle with a measure that is greater than 0 and less than 90. Write a tip about the difference between an acute angle and an obtuse angle. A geometric shape formed when two rays share the same endpoint. Draw examples of two different angles. Circle the larger angle. The point at the beginning of a ray or line segment. How many endpoints are on a ray? How many endpoints are on a line segment? The fold line indicating that a figure s two halves match exactly. A straight set of points that extend forever in opposite directions. The prefix a- can mean not, without. Draw an asymmetrical object in the space below. Line is a multiple-meaning word. Write a sentence using it as a verb. Draw or write examples for each card. Be sure your examples are different from what is shown on each card.

3 Vocab 0 line segment line symmetry A line segment AB or AB B Lesson 14 8 obtuse angle obtuse triangle R G T Lesson 14 2 one-degree angle parallelogram parallel ( ) Lesson 14 2 perpendicular ( )

4 Ideas for Use Design a crossword puzzle. Use the definition for each word as the clues. If a figure can be folded over a line so that one half of the figure matches the other half, it has line symmetry. Write a tally mark on each card every time you use the word. Challenge yourself to use at least 3 tally marks for each card. A part of a line between two endpoints. Explain the difference between a line and a line segment. How could you demonstrate to a friend that a circle has line symmetry? A triangle with one obtuse angle. Name one way in which obtuse and acute triangles are similar, and one way in which they are different. Lines that are always the same distance apart. Parallel lines do not meet. An angle that measures greater than 90 but less than 180. Draw an obtuse angle and a right angle below. Circle the obtuse angle. 1 An angle that turns through _ of a circle. 360 How many one-degree angles are in a cirlce? Lines that meet or cross each other to form right angles. Find two examples of perpendicular line segments in the room. A quadrilateral with opposites sides equal in length and parallel. Opposite angles have the same size. Describe the angles of the parallelogram shown on this card. Give examples of three shapes that have at least one set of parallel line segments.

5 Vocab point ray B ray MN or MN rectangle rhombus Lesson 14 8 right angle( ) M right triangle square trapezoid N

6 Ideas for Use Practice your penmanship! Write each word in cursive. A part of a line that has one endpoint and goes on forever in one direction without ending. What does the multiple-meaning word ray mean in this sentence? A ray of sunshine shone on the wall. A quadrilateral with 4 equal sides. Opposite sides are equal in length and parallel. Is a rhombus also a trapezoid? Explain. Work with a partner to name a part of speech of each word. Consult a dictionary to check your answers. An exact location represented by a dot. Write a sentence using the multiple-meaning word point as a verb. A quadrilateral with 4 right angles. Both sets of opposite sides are equal in length, and the other sides are parallel. A triangle with one right angle. An angle with a measure of 90. The word right has many meanings. Use a dictionary to find a synonym and an antonym for right. Explain how perpendicular lines and right angles are related. A quadrilateral with exactly one pair of parallel sides. A quadrilateral with 4 right angles and 4 equal sides. Opposite sides are equal in length and parallel. Draw a trapezoid and a parallelogram below. Circle the trapezoid. Are all squares rectangles? Are all rectangles squares? Solve this riddle: I am a place to play a sport. A net divides each of my sides equally. I m shaped like a rectangle. What am I?