Handout
Shmoop

Coordinate Proofs

For Students 8th - 11th Standards
How do you know you know? Prove it! The guide goes through several examples and includes a link to a video to teach learners how to work through coordinate proofs. The goal is to prove that different shapes are indeed that shape. 
Handout
Geometry Help

Geometry Help: What Are Parallel Lines in Geometry?

For Students 9th - 10th Standards
Explains the basic concept of parallel lines in Geometry with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Handout
Maths Challenge

Maths challenge.net: Three Circles

For Students 9th - 10th Standards
This is a proof problem, considered a "three star" geometry problem requiring knowledge of proofs and properties of circles.
Handout
Geometry Help

Geometry Help: What Are Perpendicular Lines in Geometry?

For Students 9th - 10th Standards
Explains the basic concept of perpendicular lines with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Handout
Geometry Help

Geometry Help: Square Inscribed in a Circle

For Students 9th - 10th Standards
Explains the basic concept of a square inscribed in a circle with step-by-step instructions and methods for solving specific problems on your own relating to this topic.