unit 10: 2d geometry · pdf file2 d geometry notes.notebook 7 may 12, 2014 part 2:...
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Unit 10: 2D Geometry
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All About Triangles!
Part 1: Classifying Triangles
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Click the image for a video to review triangle classification!
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Part 2: Drawing TrianglesDrawing Triangles when given angles
Click the image for a video to help you learn how to draw triangles!
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Drawing triangles when given side lengths and angles:
Equilateral Triangle with 8 cm sides and all 60 degree interior angles
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1. Draw a scalene triangle.
2. Draw an acute triangle.
3. Draw an obtuse isosceles triangle.
4. Draw a triangle with one angle measuring 65 degrees and one angle measuring 40 degrees. Write the measure of the third angle on your triangle. What kind of triangle did you make?
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Part 3: Regular and Irregular Polygons
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Regular Polygons Irregular Polygons All angles are equal. All side lengths are equal. Symmetrical.
Can you find regular and irregular polygons in our classroom?
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Part 4: Triangle Congruency Congruent The same in SIZE and SHAPE.
How can you tell if two polygons are congruent?
1. They have the same side lengths and angles (measure sides and angles in both triangles to see if they are congruent).
2. Superimpose one triangle onto the other (use tracing paper to trace the first shape and lay it onto the second triangle to see if they match).