The purpose of this lesson is to enable students to understand angle measurement and become proficient in the use of a protractor. These are essential basic skills for further work in geometry and in a wide variety of career fields such as carpentry, surveying, engineering, and drafting.
At the end of this lesson, students will be able to
measure a variety of angles using a protractor.
classify angles as acute, obtuse, or right.
Student Target
At the end of this lesson, students will be able to
measure a variety of angles using a protractor.
classify angles as acute, obtuse, or right.
CCR Focus Standards
Geometry - Level C
Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.
Supporting Standards
Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
a. An angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a “one-degree angle,” and can be used to measure angles.
b. An angle that turns through n one-degree angles is said to have an angle measure of n degrees.
Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.
Standards for Mathematical Practice
Use appropriate tools strategically. (MP.5)
Attend to precision. (MP.6)
Look for and express regularity in repeated reasoning. (MP.8)
KYAE Employability Standards
E.6 Identify and effectively use skills and materials needed for a particular task.
E.7 Accurately analyze information and respond appropriately.
