Created on: April 29, 2015

Website Address: https://library.curriki.org/oer/Cluster--Prove-geometric-theorems

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- Unit 5 - Circles With and Without Coordinates
- Unit 6 - Applications of Probability

- Cluster - Experiment with transformations in the plane.
- Cluster - Understand congruence in terms of rigid motions.
- Cluster - Prove geometric theorems.
- Cluster - Make geometric constructions.

IN COLLECTION

Encourage multiple ways of writing proofs, such as in narrative paragraphs, using flow diagrams, in two-column format, and using diagrams without words. Students should be encouraged to focus on the validity of the underlying reasoning while exploring a variety of formats for expressing that reasoning. Implementation of G.CO.10 may be extended to include concurrence of perpendicular bisectors and angle bisectors as preparation for G.C.3 in Unit 5.

Standards: G.CO.9, G.CO.10, G.CO.11

Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment’s endpoints.

Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.

Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.