# Definitions and Introduction to Proof

## Formal arguments of mathematical statements written in paragraph, two-column, and flow diagram formats.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## SLT 37 Create proofs in multiple ways to prove triangles are congruent.

by MCPS Math //at grade
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• Study Guide

## Theorems on Lines, Angles, and Triangles

by Meera Santhanam //at grade
This study introduces basic two column proofs involving lines, angles, and triangles. Some of these include the straight line theorem, alternate exterior angles theorem, and vertical angles theorem. It also introduces proof related vocabulary.
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