Angles and Lines
Students will be able to draw, identify, and define different types of angles and lines.
Introduction (5 minutes)
- Tell students that they are going to learn about various geometric terms today.
- Ask if they know any, and have them define them.
Explicit Instruction/Teacher Modeling (10 minutes)
- Direct your students to stand and show the words using their arms.
- Explain that a point is a dot, and it can be labeled with any letter. Have students show you a point using their fingers.
- Explain that a line has no end or beginning. Have students use their arms to show a line.
- Remind your students that a line segment has a beginning and end. Have your students use fingers to show a line segment.
- Tell your students that a ray has a beginning or end but not both. Have students use their arms to show a ray.
- Explain that an obtuse angle is more than 90 but less then 180 degrees. Use arms to show an obtuse angle.
- Define an acute angle as one that is more than zero but less then 90 degrees. Use arms to show an acute angle.
- Remind your students that a right angle is 90 degrees. Use arms to show it.
- Tell your students that perpendicular lines form a right angle.
- Explain that parallel lines go in the same direction.
Guided Practice/Interactive Modeling (10 minutes)
- Instruct students to create a 3 column chart in their notebooks and fill out the word, definition, and drawing for each key word.
Independent Working Time (20 minutes)
- Give your students the Name That Angle worksheet.
- Instruct students to draw the following shapes: rectangle, square, triangle, trapezoid, kite, and rhombus.
- Have your students trace the parallel lines on each shape in red and perpendicular lines on each shape in blue.
- Go over both assignments as a class.
- Enrichment: Give your students the Hidden Angles worksheet to determine where angles are in pictures.
- Support: Instruct students to get small whiteboards. Practice the various words with them on their whiteboards. For example, ask students to draw an obtuse angle. Keep repeating until students are able to represent the angles from memory.
Assessment (15 minutes)
- Hand each student 9 index cards.
- Instruct your students to put each key term and picture on the front of the card and the definition on the back.
- Post the words on the board, and have your students pair up to review these flashcards.
Review and Closing (10 minutes)
- Watch the Types of Angles video.
- Discuss with students what they learned from the video.