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## Missing Angles

Use what you know about complementary and supplementary angles together with the properties of triangles to calculate the missing angles (shown as dots.)

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## Related Resources

The various resources listed below are aligned to the same standard, (8G05) taken from the CCSM (Common Core Standards For Mathematics) as the Geometry Worksheet shown above.

*Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so. *

### Example/Guidance

#### Lines and Angles

### Worksheet

- Missing Angles (3-Page)
- 180° in a Triangle Activity (2-Page Cutting Out Activity)
- 360° in a Quadrilateral Activity (Activity: Cutting & Rearranging Corners)

Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

*Understand congruence and similarity using physical models, transparencies, or geometry software*

- Congruent Triangles: With Transformations (From Example/Guidance)
- Congruence & Similarity: Dilations (From Example/Guidance)
- Similarity in Triangles (From Example/Guidance)
- Transformations & Coordinates (From Example/Guidance)
- Transformations (3-Page) (From Worksheet)
- Congruent Worksheet (1 of 3) (From Worksheet)
- Congruent Worksheet (2 of 3) (From Worksheet)
- Congruent Worksheet (3 of 3) (From Worksheet)
- Transformations: Vector Translations (From Worksheet)
- Transformations: Rotations & Reflections (From Worksheet)
- Transformations: Calculating Coordinates (From Worksheet)
- Similar Figures (From Worksheet)
- Similar Triangles (From Worksheet)
- Similar Triangles (1 of 2) e.g. calculating scale factors and dimensions (From Worksheet)
- Similar Triangles (2 of 2) (From Worksheet)
- Dilations (Size Transformations) (From Worksheet)
- Similar Figures (From Worksheet)