Our Angles with Circles lesson plan begins with a review of angles, introduces the concept that angles can be measured using circles, and provides relevant vocabulary. The names of several types of angles, with illustrations and descriptions, are included, such as acute and obtuse. During this lesson, students are asked to make their own “angle explorer” out of pipe cleaners and straws to measure given angles. They are also asked to draw given times on clocks and name the angle that the hands make and match angle names to their descriptions to demonstrate their understanding of the lesson vocabulary.
At the end of the lesson, students will be able to understand that an angle is measured with reference to a circle such that the center is the common endpoint of the rays and understand that the measurement of the angle is the fraction of the circular arc.
Common Core State Standards: CCSS.Math.Content.4.MD.C.5.A