eBook
CK-12 Foundation

Ck 12: Interactive Middle School Math 8 for Ccss

For Students 8th
A complete CCSS Grade 8 Mathematics course that includes interactives in every lesson, plus videos, hands-on activities, and questions with immediate feedback. Every lesson also has specifically chosen 'Related Modalities' that teach the...
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.