Instructional Video
Sophia Learning

Sophia: Cross Product

For Students 9th - 10th
This lesson introduces the cross product
Instructional Video
Khan Academy

Khan Academy: Area of Kites

For Students 6th - 7th
Video lesson explores how to find the area of a kite which is a quadrilateral with two distinct pairs of equal adjacent sides. [3:48]
Instructional Video
Study Pug

Study Pug: Perpendicular Line Proofs

For Students 9th - 10th Standards
Video lesson explains angles, lines, and transversals. [9:33]
Instructional Video
Khan Academy

Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle

For Students 9th - 10th Standards
A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...
Instructional Video
Sophia Learning

Sophia: Interior and Exterior Angles of Polygons

For Students 9th - 10th
Interior and exterior angles of polygons are investigated in this geometry resource. Definitions and video lessons are included.
Instructional Video
Sophia Learning

Sophia: Proof (Harder)

For Students 9th - 10th
This geometry resource discusses two types of proof. Video lessons demonstrating a flow proof and a two-column proof are included.
Instructional Video
Sophia Learning

Sophia: Torque Defined Mathematically

For Students 9th - 10th
Learn how the equation for torque was derived through this video lesson. The lesson explains how to use geometry to find the lever arm and perpendicular component of the force. [6 min, 55 secs]

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