LP+Example+2


 * Grade Level** - This lesson plan is designed for fourth graders.


 * Subject/Topic -** The subject area is Math and the topic is identifying an isosceles triangle by using a circle.


 * Duration** - For this particular lesson plan, I will need 30 minutes.


 * Materials** - The materials needed for this lesson is paper, a ruler, and a compass.


 * Standards** - MTH (4) 11. Identify triangles, quadrilaterals, pentagons, hexagons, heptagons, and octagons based on the number of sides, angles, and vertices.

1. Design a circle using a compass. 2. Identify the triangle made in the circle by connecting the dots previously plotted
 * Objectives** -

During my lesson, students should be following along with each step I do on the board. This way, everyone can see where to plot their lines and points in the circle.

This is a fun activity because it is very hands on. The instructions that are needed to be followed are pretty easy to understand. If a student gets confused or falls behind, it will not be a problem to take a moment to catch him or her up.

Did you know that you can create an isosceles triangle, equilateral triangle, or rhombus by using a circle? Along with other fun tools like a compass and ruler, it is a very easy task to take on. A compass is a tool that has measurements of inches and centimeters, a point at one end, and a pencil at the other. This compass creates perfect circles with steady hands. Let's practice.
 * Introduction** -

Excellent work!

Yes, the steady hand seems to be hard, but with lots of practice it will be a piece of cake. I rememeber having to re-learn how to use a compass. I did not even remember what one looked like and during class one day was using the wrong tool without even knowing. Funny, because I thought I was doing the right thing, but luckily one of my classmates helped me out.

Now that we have practiced using the compass, let us get started on using that and the ruler to make shapes with a circle.

With previous knowledge, we know that an isosceles triangle is a triangle where atleast two sides of the triangle are the same length. To find this triangle within our circle we need to first take out a sheet of paper. Make a starting point in the middle of the page with your pencil. Label that dot with any letter you like. Next, measure out 2 inches with your compass. With the pointy part of the compass of the center dot, and the pencil part spaced out two inches, draw your circle.
 * Activities/Procedures -**

Any questions? Great! Let's move on.

Now, plot two points anywhere on the circle. You can label those any letters you like, but make sure they are different from the center. Take your ruler and from the center dot, connect one line to one point, and one line to the other. Also, draw a line that connect the two dots together. This line will be very close to the curve of your circle.

Awesome job!

See there, we now have a triangle. Because each of the two points are the same distance from the center, we now have two congruent (or equal) sides. The one that connects the two points together with obviously shows it is not the same.

We now have formed an isosceles triangle using a compass, ruler, and paper.

Wonderful job everyone!

__Informal__ 1. "Is everyone comfortable with using the compass?" 2. "Does everyone see how the plotted points and center come together to form a triangle?"
 * Main Activities Assessment -**

__Formal__ I could give a quiz and the questions could be as follows: 1. What is an isosceles triangle? 2.At least how many sides of the triangle must be congruent? 3. On your own, first construct a circle with the radius of 4 inches, then make a triangle.

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 * Resources -**