Transcript Measuring Shapes in Geosketch

Measuring Shapes Using
Geometer’s Sketchpad
Middle School iSquad Grades 6-8
Focusing Questions
• How can animation help illustrate a
simple geometric concept?
• Why should we use Geometer’s
Sketchpad as a tool to learn about
Geometry?
Instruction
Framing The Session
• Who can tell me what this simple
animation illustrates?
• We will learn how to create an animated
triangle and measure the angles. This
will allow us to answer this question.
Teaching
• Watch me as I show you how to draw a
triangle and measure it on the
Sketchpad software. There are many
steps involved in this process. We will
plot the points on the canvas. Next, we
will draw the lines. Lastly, we will use
the measure menu to make the
measurements.
Work Time
Guided Practice
• Now it is your turn to construct a triangle
and measure its angles. Take some
time to create the triangle Draw in all
the lines. Measure three angles and find
the area. In addition, take a
measurement of the triangle’s
perimeter. What happens to the sum of
the angles when you expand the
perimeter and area?
Getting Started
• You will be creating a triangle. After you
create the triangle, you will measure the
three angles in a triangle. You will
measure the area and perimeter. In
addition, you will measure the sum of
the angles using the calculate function
on the Top menu.
Work Time
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There are five basic steps I will show
you. You will follow these steps to
complete the task.
Create the Angle
Sum of Angles in a Triangle
Construct a Shape
Measure the Perimeter and Area
Animate a Shape
Share
Share
• Many of you did a really good job. Why
don’t we share what we found out about
making a triangle? What advantages
did you find in using this program? Who
can share with the rest of the Squad
some benefits of using Geometer’s
Sketchpad?
How does this work address the
questions that began the session?
• Through animation, we can visually see
some of the concepts of geometry.
• Geometer’s Sketchpad makes learning
geometry fun. It allows us to construct
geometric shapes with ease. It also allows
us to make simple measurements.