Tenth graders learn to write geometric proofs — building a logical chain from given information to a conclusion, where every statement is backed by a definition, postulate, or theorem — the heart of mathematical reasoning.
Students will be able to…
In math, it’s not enough for something to LOOK true — you have to PROVE it. How do you build an airtight logical argument, step by step, that leaves no doubt?
Project each item and have students choose the correct answer about proof structure. The tool explains statements and reasons.
Tap any phase to open the teacher moves and student actions.
In math, it’s not enough to LOOK true — you must PROVE it. How?
Teacher models.
Class uses Proof Logic.
Students write proofs.
One proof step.
Aligned to the Common Core State Standards for Mathematics (High School Geometry).
Prove theorems about lines and angles.
Prove theorems about triangles.
Prove theorems about parallelograms.
Apply geometric methods to solve problems.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students write a complete two-column proof for a simple theorem, like “vertical angles are congruent.” A printable proofs sheet is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.