Geometry

lixiangyin1989

In this collection, students will find many useful materials that we will cover in this class. Students can learn and do the worksheet provided to practice for better understanding.


  • 1. Sum the interior angles of a triangle must be 180
  • 2. Unit Circle - Trig functions vs Geometry definitions
  • 3. Exterior Angles of Polygons
  • 4. Pythagorean Triple 3 5 6
  • 5. Alternating Interior Angles
  • 6. Exploring Inscribed Angles (of circles)
  • 7. Explore Parallel Lines and Angle Pairs
  • 8. Vertical Angles (vs. non-vertical angles)
  • 9. Explore Opposite Angles of Inscribed Quadrilaterals

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Sum the interior angles of a triangle must be 180

Adjust the sliders to move the triangle around. You'll find that the three angles always add to form a straight line.
– Splineguy_1

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