 # Compare and classify other polygons.

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Compare and classify other polygons.
Module 7 Lesson 5 Compare and classify other polygons.

Multiply by 5 5 x 5 = _____ 3 x 5 = _____ 4 x 5 = _____ 25 15 20 5 10
Let’s skip-count up by FIVES to find the answer. Hold up a finger for each five. 5 10 15 20 25 Let’s see how we can skip-count down also. Start at 25 by holding up five finders. Fold down one finger each time you count down.

Multiply by 5 Pattern Sheet
2 minutes This ‘sand timer’ will start on a mouse click anywhere on the slide. The ‘sand’ will drain from the top section to the lower section and when completed will show the word ‘End’. To change the timings of this timer, you need to enter the animation settings, and change the timings for the Isosceles Triangles. There will be 2 that need changing (to the same amount) – one animates the top triangle emptying, whilst the other animates the bottom triangle filling. When you change the timings these have to entered as a number of seconds. End

Equivalent Counting With Units of 6
1 2 3 4 5 6 7 8 9 10 1 six 2 sixes 3 sixes 4 sixes 5 sixes 6 sixes 7 sixes 8 sixes 9 sixes 10 sixes 12 18 24 30 36 42 48 54 60 And for a challenge, let’s alternate between numbers and units of 6. Start with units of 6 And now alternate starting with numbers of 6. Now let’s count up to 10 groups of 6, or 10 sixes. First lest count to 10 by ones. Now skip count to 60 by 6.

Classify the Polygon 4 quadrilaterals 1 Trapezoids!
How many sides does this polygon have? 4 Polygons with four sides are called: quadrilaterals How many sets of parallel lines does this quadrilateral have? 1 Quadrilaterals with one set of parallel lines are called: Trapezoids!

Classify the Polygon Yes Zero Yes
Is this polygon a quadrilateral? Yes How many right angles does this particular quadrilateral have? Zero Is this quadrilateral a trapezoid? Yes Why? It has at least one set of parallel lines.

Classify the Polygon Two Parallelograms.
How many sets of parallel lines does it have? Two What do we call all quadrilaterals that have two sets of parallel sides? Parallelograms.

Classify the Polygon Yes Four. Is this polygon a quadrilateral?
How many right angles does this quadrilateral have? Four.

Classify the Polygon Yes It has at least one set of parallel lines.
Is this polygon a trapezoid? Yes Why? It has at least one set of parallel lines.

Classify the Polygon Yes It has two sets of parallel lines.
Is this trapezoid also a parallelogram? Yes Why? It has two sets of parallel lines.

Classify the Polygon Yes
Is this parallelogram also a rectangle? Yes Why? It has two sets of parallel lines and four right angles.

Classify the Polygon ✔ ☐ ✔ ☐ ✔ ☐ ✔ ☐ ☐ ✔ This is a SQUARE.
Is this polygon a quadrilateral? Is this polygon a trapezoid? Is this polygon a parallelogram? Is this polygon a rectangle? This is a SQUARE. Does this polygon have 4 sides of the same length?

Concept Development You will need your index card, lesson 5 template, lesson 5 problem set, a pair of scissors, and a ruler. DO NOT CUT OR WRITE ON ANYTHING. Thumbs up when you have everything.

Group Polygons Look at Polygons M-X compare them with yesterday’s polygons. Yesterday we grouped polygons with four sides. Today we are first going to group polygons with all equal sides. What tool are we going to use to make sure the sides are precisely equal? A ruler What will be the most precise measurement? Inches, half-inches, quarter-inches or centimeters? Quarter Inches, because they are the smallest unit.

Group Polygons Now measure the sides of all polygons M-X to the nearest quarter inch. Write the measurements on the inside lines so you will remember them later. Cut out the Polygons M-X. Take your time to make good cuts. Write your initials on the back of each of your cut out shapes – that way if we find some on the floor we can get them back to you. Throw away/recycle your paper scraps. Do 5 jumping jacks when you’re done.

Group Polygons ALL SIDES ARE EQUAL ALL SIDES ARE NOT EQUAL
Look at your shapes. Group them into two categories: ALL SIDES ARE EQUAL ALL SIDES ARE NOT EQUAL Once the polygons are grouped, fill out the first two rows of your problems set.

All Sides Are Equal All Sides Are Not Equal

Group Polygons AT LEAST 1 RIGHT ANGLE AT LEAST 1 SET OF PARALLEL LINES
Now look at the next two rows of your problem set: AT LEAST 1 RIGHT ANGLE AT LEAST 1 SET OF PARALLEL LINES When it says “at least” can the polygon have more than one set? Yes, It just has to have one for sure

Group Polygons Use your right angle tool to measure and group polygons that have at least one right angle.

Polygons with at least 1 right angle

Group Polygons Now group polygons with at least one set of parallel lines.

At least one set of parallel lines

Group Polygons Now let’s look at the polygons with equal sides. What do you notice about the side lengths of the polygon marked S? They are all the same length. What do we know about the angles? They are all right angles ... … so they are all the same.

Group Polygons 5 Pentagon No, because not all the angles are equal.
A polygon with all equal sides and all equal angles is called a regular polygon. How many sides does this polygon have? 5 What do we call a polygon with five sides? Pentagon Is this a regular pentagon? No, because not all the angles are equal.

Compare Polygons Count each polygon’s sides, and write the number of sides under the polygon’s letter. Then group the polygons with the same number of sides.

Compare Polygons Let’s compare polygon’s with the same number of sides. Both Polygon U and Polygon T have six sides. Polygon U is a hexagon. Is Polygon T a hexagon, too? Yes. It has six sides, but they are not equal sides … … so Polygon T is a hexagon but not a regular hexagon.

I’ll call out an attribute.
You hold up a polygon that fits the attribute. Polygons that do NOT have all equal sides.

Show polygons with EXACTLY one right angle.

Show polygons with FOUR equal sides.

Show polygons with only one set of parallel lines.

Show polygons with exactly 3 sets of parallel lines.

Problem Set Finish Problems 2 - 4