Angle Rules Summary
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This document provides reminders of several geometric rules for determining unknown angle measures, including that angles in a straight line equal 180 degrees, angles in a triangle equal 180 degrees, interior angles of a quadrilateral equal 360 degrees, vertically opposite angles are equal, corresponding angles are equal, and alternate angles are equal. Examples are given applying each rule to solve for unknown angle measures.
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Angle Rules Summary
- 1. Triangles, Straight and Parallel Lines To complete the homework you need to use combinations of the following rules: Angles in a straight line, Angles in a triangle and quadrilateral, Corresponding, Alternate, Interior and Vertically Opposite angles. The following slides give reminders for each rule.
- 2. Triangles, Straight and Parallel Lines What size is angle A ? Angles in a Straight Line Equal 180 ° A 45 °
- 3. 45 ° What size is angle B ? B Angles in a Triangle Equal 180 ° Triangles, Straight and Parallel Lines
- 4. 90 ° What size is angle B ? B Triangles, Straight and Parallel Lines 90 ° 90 ° Angles in a Q uadrilateral Equal 360 °
- 5. What size is angle C ? 40 ° Vertically Opposite Angles are Equal Triangles, Straight and Parallel Lines C
- 6. D What size is angle D ? 140 ° Interior Angles Sum to 180 ° Triangles, Straight and Parallel Lines
- 7. 40 ° What size is angle E ? E Corresponding Angles are Equal Triangles, Straight and Parallel Lines
- 8. 140° F What Size is angle F ? Alternate Angles are Equal Triangles, Straight and Parallel Lines