## CCSS.MATH.CONTENT.HSG.CO.C.10: 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.

There are 73 resources.
Title Description Thumbnail Image Curriculum Topics

## Definition--Theorems and Postulates--AAA Theorem

Definition--Theorems and Postulates--AAA Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Definition--Theorems and Postulates--AAS Theorem

Definition--Theorems and Postulates--AAS Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Definition--Theorems and Postulates--Alternate Interior Angles Theorem

Definition--Theorems and Postulates--Alternate Interior Angles Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of an Angle

## Definition--Theorems and Postulates--ASA Theorem

Definition--Theorems and Postulates--ASA Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of an Angle

## Definition--Theorems and Postulates--Converse of Same-Side Interior Angles Postulate

Definition--Theorems and Postulates--Converse of Same-Side Interior Angles Postulate

This is part of a collection of definitions of geometric theorems and postulates.

Definition of an Angle

## Definition--Theorems and Postulates--Converse of the Alternate Interior Angles Theorem

Definition--Theorems and Postulates--Converse of the Alternate Interior Angles Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of an Angle

## Definition--Theorems and Postulates--Converse of the Corresponding Angles Theorem

Definition--Theorems and Postulates--Converse of the Corresponding Angles Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of an Angle

## Definition--Theorems and Postulates--Corresponding Angles Theorem

Definition | Theorems and Postulates | Corresponding Angles Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of an Angle

## Definition--Theorems and Postulates--Same-Side Interior Angles Postulate

Definition--Theorems and Postulates--Same-Side Interior Angles Postulate

This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Definition--Theorems and Postulates--SAS Similarity Theorem

Definition--Theorems and Postulates--SAS Similarity Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Definition--Theorems and Postulates--SAS Theorem

Definition--Theorems and Postulates--SAS Theorem

This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Definition--Theorems and Postulates--SSS Postulate

Definition--Theorems and Postulates--SSS Postulate

This is part of a collection of definitions of geometric theorems and postulates.

Definition of a Triangle

## Math Clip Art--Angle Illustrations--Supplementary Angles--Labeled

Math Clip Art--Angle Illustrations--Supplementary Angles--Labeled

This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles and Applications of Angles and Planes

## Math Clip Art--Angle Illustrations--Supplementary Angles--Unlabeled

Math Clip Art--Angle Illustrations--Supplementary Angles--Unlabeled

This is part of a collection of clip art images showing different types of angles. Each type of angle measure includes a labeled and unlabeled version.

Angles and Applications of Angles and Planes

## Math Example--Geometric Proofs--Example 1

Math Example--Geometric Proofs--Example 1

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 10

Math Example--Geometric Proofs--Example 10

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 11

Math Example--Geometric Proofs--Example 11

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 12

Math Example--Geometric Proofs--Example 12

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 13

Math Example--Geometric Proofs--Example 13

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 2

Math Example--Geometric Proofs--Example 2

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 3

Math Example--Geometric Proofs--Example 3

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 4

Math Example--Geometric Proofs--Example 4

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 5

Math Example--Geometric Proofs--Example 5

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 6

Math Example--Geometric Proofs--Example 6

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle

## Math Example--Geometric Proofs--Example 7

Math Example--Geometric Proofs--Example 7

This is part of a collection of math examples that focus on geometric proofs.

Parallel Lines and Definition of a Triangle