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2-14-13 Triangles

2-14-13 Triangles EQ: Why would you need to know different types of triangles? In what profession would you need to know about the properties of different types of triangles?. BOP AND DWP. (Base X height) ÷ 2 = area of a triangle. Check #1-13 on homework. TRIANGLES.

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2-14-13 Triangles

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  1. 2-14-13 Triangles EQ: Why would you need to know different types of triangles? In what profession would you need to know about the properties of different types of triangles? BOP AND DWP

  2. (Base X height) ÷ 2 = area of a triangle

  3. Check #1-13 on homework.

  4. TRIANGLES

  5. D90 Triangles Angles Investigation SUM INVESTIGATION EVIDENCE Complete activity on a separate sheet of paper to turn in. Step 1: You will need two triangles that are not congruent. Label the interior angles of each triangle A, B, and C. Step 2: Use a protractor to measure each angle in triangle #1. Find the sum of the three angles. List your measurements in a table.

  6. Step 3: If you triangle is not already cut out, please cut out your triangle. Step 4: Tear the three angles part. Example below: Step 5: Rotate the angles so all vertices line up. Glue your connected angles in onto your paper.

  7. Step 6: Repeat steps 1-5 for your second triangle recording the information in your table. Step 7: Record what you notice about both triangles whenYou line up their angles. Step 9: Choose one of your outcomes and record it on the CLASS DATA SHEET. Step 10: Based on your investigation so far, complete the following statement: The sum of the interior angles of any triangle is_____.

  8. PART 2- In the following part of this investigation you will work with Isosceles triangles. Step 1: Use a protractor to measure the angles of the isosceles triangles on the handout. Label each angle with the measures. Step 2: Draw two isosceles triangles. Measure your angles. Step 3: Complete the statement- In an isosceles triangle, two of the angles will always be ___________________.

  9. http://www.youtube.com/watch?v=T8z9KqlA6A8&feature=player_embeddedhttp://www.youtube.com/watch?v=T8z9KqlA6A8&feature=player_embedded

  10. THE TRIANGLE INEQUALITY THEOREM During this activity, you will compare he sum of the measures of any two sides of a triangle with the measure of the third side. You will need: Ruler Handout 3 Fuzzy Sticks Straws

  11. During this activity, you will compare the sum of the measures of any two sides of a triangle with the measure of the third side. 1. Bend a fuzzy stick to form a triangle. Measure each side length to the nearest tenth of a centimeter. In a table, record the measures of each side of the triangle from smallest to largest; then, find the sum of the measures of the small and medium sides. Repeat this activity twice, with two other triangles, to complete the chart. What must be true about the lengths of the sides?

  12. 2. Bend a fuzzy stick so that it is impossible to form a triangle. Measure each side of the non-triangle to the nearest tenth of a centimeter. In the table below, record the measures of each side of the non-triangle from smallest to largest; then, find the sum of the measures of the small and medium sides. Repeat this activity twice, with two other non-triangles, to complete the chart.

  13. THE TRIANGLE INEQUALITY In a triangle with side lengths a, b, and c, _______ + _______ > _______ _______ + _______ > _______ _______ + _______ > _______

  14. Use whiteboards

  15. No YES YES

  16. Summary: How would you explain to someone why every sum of the angles of a Every triangle must equal 180 degrees? Homework: Finish vocabulary cards-will count as a quiz grade; Work on WbW #1 due on Friday. Finish any work started in class but not finished.

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