MAFS.912.G-CO.3.10

MAFS.912.G-CO.3.10 - Prove theorems about triangles. 

1. The benchmark will be assessed using Drag and Drop Response, Hot Text Response, Movable Text Response, Multi-select Response, Multiple choice Response, Open Response, or Selectable Text.

2. Theorems are restricted to: 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.

3. Items can include narrative proofs, flow-chart proofs, two-column proofs, or informal proofs.

4. Items may require students to give statements and/or justifications to complete formal and informal proofs.

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Nancy wrote a proof about the figure shown below.

In the proof below, Nancy started with the fact that  is a perpendicular bisector of  and proved that   WYZ is isosceles.

Which of the following correctly replaces the question mark in Nancy's proof?

1. ASA
2. SAA
3. SAS
4. SSS

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Select sample problems taken from FLDVIPN teacher materials

Violet Esopakis - Palm Beach Co.
Stephanie Fitzwater - Seminole Co.
Angela Kerins - Orange Co.
Lisa Lasseter - St. Johns Co.
Jodi Van Wagoner - Brevard Co.