Unit 9 Contents

Use the Mosaic Puzzle pieces from the Student Activity Book to answer Questions 4–11. Use the shapes names and numbers. The Polygon Names pages in the Reference section may help you.

4. I have three sides. One of my angles is obtuse. Who am I?
5. I have three equal sides. Who am I?
1. I have four sides. I have two pairs of parallel sides. Who am I?
2. Trace the shape that answers this riddle. Use your drawing to show and tell how you know your answer is correct.
7. I am not a quadrilateral. All of my angles are equal. Who am I?
8. I am a quadrilateral. All of my angles are equal. Who am I?
9. I have four sides. Two sides that meet at an acute angle are equal. Who am I?
10. How are Shapes 3 and 4 from the Mosaic Puzzle pieces alike? How are they different? Look at the number of sides, length of sides, number of angles, and size of angles. Use drawings and words in your answer.
11. How are Shapes 4 and 7 from the Mosaic Puzzle pieces alike? How are they different? Think about their properties. Use drawings and words in your answer.

Use the Classifying Shapes pages in the Student Activity Book to practice identifying congruent shapes; lines of symmetry; and slides, flips, and turns.