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7th Grade Math / Lesson 2: Angles

What will we be learning in this lesson?

  • In this lesson, you will learn about angles and their measures.
Vocabulary words are found in this purple color throughout the lesson. Remember to put these in your notebook.




  • A right angle is an angle that measures 90 degrees. If you look at the protractor, to measure 90 degrees, the second ray needs to go straight up from the circle where the vertex is placed.

  • A right angle has perpendicular sides. Perpendicular sides are formed by two lines that intersect at 90 degrees.

  • A straight angle is a straight line. It measures 180 degrees.

  • An acute angle is any angle that measures less than 90 degrees.

  • An obtuse angle is any angle that measure more than 90 degrees.

    • Can you identify an angle and its measure?
    • Go back to the classroom to get to your homework and any other items you need to attend to.