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What’s Up With Triangles?

What’s Up With Triangles?. Math Lollapalooza May 7, 2013. Presented by Mary Alice Hatchett, President of TCTM. How many triangles?. A treasure trove of triangles. A treasure trove of triangles NCTM article from January 2010 journal ‘Teaching Children Mathematics’.

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What’s Up With Triangles?

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  1. What’s Up With Triangles? Math Lollapalooza May 7, 2013 Presented by Mary Alice Hatchett, President of TCTM

  2. How many triangles? A treasure trove of triangles A treasure trove of triangles NCTM article from January 2010 journal ‘Teaching Children Mathematics’

  3. Triangles in the REAL World

  4. TRIANGLE a closed shape formed by connecting three line segments. Triangle Vocabulary

  5. EQUILATERAL TRIANGLE a triangle with all three sides congruent and all angles measuring 60 degrees CLASSIFIED BY SIDE LENGTH Triangle Vocabulary

  6. SCALENE TRIANGLE a triangle with no congruent sides or congruent angles. CLASSIFIED BY SIDE LENGTH Triangle Vocabulary

  7. ISOSCELES TRIANGLE a triangle with two congruent sides and congruent angles opposite the congruent sides CLASSIFIED BY SIDE LENGTH Triangle Vocabulary

  8. RIGHT TRIANGLE a triangle that has one 90 degree angle CLASSIFIED BY ANGLE MEASURE Triangle Vocabulary

  9. ACUTE TRIANGLE all angles in the triangle are less than 90 degrees CLASSIFIED BY ANGLE MEASURE Triangle Vocabulary

  10. OBTUSE TRIANGLE a triangle with one angle that is greater than 90 degrees CLASSIFIED BY ANGLE MEASURE Triangle Vocabulary

  11. VERTEX ANGLE OF A TRIANGLE the angle in an isosceles triangle that is not opposite a congruent side Triangle Vocabulary

  12. HYPOTENUSE OF A TRIANGLE the side of a right triangle opposite the right angle; the longest side of a right triangle Triangle Vocabulary

  13. LEG OF A TRIANGLE one of the sides of a right triangle that is not the hypotenuse. Triangle Vocabulary

  14. ALTITUDE OF A TRIANGLE a line segment that goes from a vertex to the opposite side (BASE) forming a right angle ( also known as HEIGHT) Triangle Vocabulary

  15. BASE ANGLES OF A TRIANGLE two congruent angles that are opposite the congruent sides in a isosceles triangle Triangle Vocabulary

  16. You will need: • One set of game cards (shuffled) per pair of students • One game board OR the label cards Take a minute to read the directions. Triangle Match Up Game

  17. Right & Isosceles Obtuse & Isosceles Acute & Scalene Acute & Equilateral Acute & Isosceles Obtuse & Scalene Right & Scalene Not a triangle Triangle Match Up Game

  18. Triangle Match Up Game

  19. You need: • 6 strips of paper (about 2cm by 21 cm) • Tape • Centimeter grid paper • Centimeter ruler Between peRIMeter and Height

  20. Between you and your partner – build: • Fold one strip into thirds, and tape to make a triangle. Label it shape “A” • Fold the other strips into 4ths, 5ths, 6ths, 7ths, and 8ths. Label as B, C, D, E, and F. Between peRIMeter and Height

  21. Measure the length of 1 side of each shape and write the measurement on your shape. ORDER: The shapes from shortest side length to longest side length. Between peRIMeter and Height

  22. Stand each shape on 1 side. ORDER: The shapes from shortest to tallest. Measure the height of each shape and write the measurement (h=___) on the back of the side length. Between peRIMeter and Height

  23. Lay your shapes FLAT on the grid paper. Carefully trace around each shape. COUNT: The number of square units inside your shape. Record your count on the grid AND record the shape ID. CAREFULLY: Cut out each shape and order them from least number of squares to most number of squares. Between peRIMeter and Height

  24. Lay your shapes FLAT on the grid paper. Carefully trace around each shape. COUNT: The number of square units inside your shape. Record your count on the grid AND record the shape ID. CAREFULLY: Cut out each shape and order them from least number of squares to most number of squares. Are they in the same order as before? Between peRIMeter and Height

  25. Thank You for attending. Don’t forget to put the AACTM Fall date on your calendar. CAMT will be in San Antonio this summer. AACTM will get together for a ‘Happy Hour’ AACTM website: www.aactm.org Mary Alice Hatchett My website: mahatchett.com My email: mahat@earthlink.net My store: www.teacherspayteachers.com/Store/Mary-Alice-Hatchett

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