All About Angles
The last time I left off, before my detour into word problems and some strategies on how to solve them, I was looking at introducing the concept of geometry. I started with learning about lines and rays, etc. So building off of that, I saw that the next step was introducing angles! This concept is introduced during the fourth grade The common core standard that align with this concept are:
CCSS.MATH.CONTENT.4.G.A.1
"Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures."
CCSS.MATH.CONTENT.4.G.A.2
"Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles."
Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement (https://www.khanacademy.org/commoncore/grade-4-MD#4.MD.C.5)
So, to refresh my memory, I visited Khan Academy which defined an angle as two rays that share a vertex. They also had some good review sheets that quickly showed some concepts related to angles (which I've shared below).
I wasn't too satisfied with the way this website relayed the content, so I looked elsewhere and came across a great website they broke it down further and simplified it.
I especially liked the second visual to show the different types of angles and their measurements. You can also introduce the students to a protractor, which is another helpful tool to measure the angles and the students are physically able to see the measurements.
This was a good way to introduce this concept, but, as always, I like to find a hands-on activity for students to do that will help them learn the concept. I found a great lesson plan on education.com, which provided teachers with a step by step way to introduce the topic and also provided a couple of activities. https://www.education.com/download/lesson-plan/all-about-angles/all-about-angles.pdf
One activity was to have the students make angles with their own bodies and arms. This is great because it can physically engage the students. Another great activity was to make an "angle poster." The students would use toothpicks and glue and markers/crayons to make the different types of angles on the poster paper. (An example is below)
This really helped to refresh the concept of angles and I feel like I have a better grasp of being able to explain this concept to students!
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