polygon attributes · 4/2/2020 · polygon attributes we have learned the basics of polygons,...
TRANSCRIPT
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Classwork 4-2-2020
Polygon Attributes
We have learned the basics of polygons, let’s learn more!
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Good morning and hello Third Graders from Mrs. Cronin!
Today is Thursday 4-2-2020
Where To Find Your Work: https://lynncronin.weebly.com/ 4-2-2020 Grade 3 Polygon
Attributes
Learning Objectives: More Polygon Attributes
Learning Activities: Please work through the PowerPoint then play the polygon game
How I will see/check your work: Email me!!
How We Communicate: email [email protected]
MA.3.MD.D.8, MA.3.G.A , MA.3.G.A.1, MA.3.G.A.2, MA.3.OA.C, MA.3.OA.C.7
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Yesterday we learned about polygons.A polygon is a special kind of shape
that is 2-D, has only straight lines and is closed.
Today we will learn about other attributes of polygons.
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An attribute is a description.When you describe a shape like a polygon
you use specific attributes like side size, equality of sides, angles, and vertices.
We will explore each attribute today and then play a game to practice.
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Side Length.Each polygon is made with straight lines.One way to measure a polygon is to measure the length of its sides.
TriangleSquare
Star
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Side Length.
A ruler will help us do that!Square
Triangle Star
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Most of the time we don’t actually measure the side lengths of a shape, we just count how many sides are the same length.
The triangle has 3 sides that are the same length
TriangleStar
This star has 10 sides that are the
same length
Square
This square has 4 sides that are the same length
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When we play shape capture we will see a screen that looks like this:
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When we play shape capture we will see a screen that looks like this:
Can you find a shape that has three sides that are the same length?
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Perfect!
The equilateral triangle has three sides that are the same length!
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Try another one…
Can you find shapes that have two sides that are the same length?
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Try another one…
There are a lot of them!
Some even have two pair that are the same. The kite for example has the two top the same plus the two bottom are also the same.
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Try this one!
Can you find all the shapes that have two pair of same side lengths (like the kite)
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Try this one!
Can you find all the shapes that have two pair of same side lengths (like the kite)
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Let’s look at another attribute
Vertices
That’s the spot where sides meet on a shape. You could also call it a corner or a point, but in math we call it a vertices. Vertices is the word that we use for more than one. One is called a vertex.
TriangleSquare
Star
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Vertex Vertices
I love this word!It might be my favorite math word!One point on a shape is a vertexClick below to hear it:https://www.youtube.com/watch?v=2HnvWbCMnF4
More than one point on a shape is a verticesClick these videos to learn how to say it:https://www.youtube.com/watch?reload=9&v=sJaYtraUu0E
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Each shape has different numbers of vertices.
Vertices
That’s the spot where sides meet on a shape. You could also call it a corner or a point, but in math we call it a vertices.
(One point on a star is called a vertex. All the points are called vertices.)
TriangleThe triangle has 3
SquareThe square
has 4
StarThe star has 10!
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How many vertices does this shape have?
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How many vertices does this shape have?
6!
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Is this shape a polygon?
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Is this shape a polygon?
Does it follow the polygon rules?
Is it 2-D?Is it closed?Are the lines straight?
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Is this shape a polygon?
Does it follow the polygon rules?
Is it 2-D?Is it closed?Are the lines straight?
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Is this shape a polygon?
Does it follow the polygon rules?
Is it 2-D?Is it closed?Are the lines straight?
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Is this shape a polygon?
Does it follow the polygon rules?
Is it 2-D?Is it closed?Are the lines straight?
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And finally, what is an angle?
Shapes are made with lines that touch at the corners.
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The angle made by those two lines is measured by how far apart they are
The first angle is a right angle. The measure from one line to another is 90° (90 degrees)
The second angle is less than 90° - it is probably about 30°
about 30°
90°
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The angle made by those two lines is measured by how far apart they are
You could think of an angle as the opposite side of the vertex.
about 30°
90°
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There are three types of angles.
Right – a square angle is 90°. It is the same as the corner of a paper or the corners on a square.
Obtuse – an obtuse angle is bigger than a square angle.
Acute – an acute angle is smaller than a square angle. (I think of it as a cute little angle!about 30°
90°
about 120°
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We will review angles later!
Right now the most important angle is a right angle.
A right angle is 90°
90°
Right Angle
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Let’s Play
Shape Capture!
https://connected.mcgraw-hill.com/em4t/emgames.game.do?gameId=X3S9JRLBFMO5J3ZF65DPZ51CMM&familyId=1J9KPPZFS5PB8HP375W1H51Y78&gameType=single-player&categoryId=JC8PY2PS1XEHKKB1K49LWQR9CE&grade=3
Click on these words
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Don’t forget to complete your Quizlet today
email me to tell me how you did on Shape Capture!