# Distance Formula Teacher Resources

Find Distance Formula educational ideas and activities

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**61**-**80**of**258**resources#### New Review Lines Parallel to a Side of a Triangle

Your geometry learners will thoroughly explore the Side-Splitting Theorem and how a line, parallel to one of the sides of a triangle, splits the other two sides proportionally. They then collaborate to complete three exploratory tasks involving geometric construction, Geometers Sketch Pad, and distance formula on a graph in the coordinate plane, to write a conjecture and test it. Finally the learners do a formal proof of the Side-Splitting Theorem and solve triangles with their new knowledge.

*x*in various types of triangles.

- Display cards and change them out as you progress through different topics
- Use the cards as review throughout the year to remind students of past learning
- Laminate the cards and allow students to sort them into topics they definitely understand, somewhat understand, and don't yet understand

*acute, right,*or

*obtuse.*