Khan Academy
Khan Academy: Area of Kites
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]
Study Pug
Study Pug: Perpendicular Line Proofs
Video lesson explains angles, lines, and transversals. [9:33]
Khan Academy
Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle
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...
Sophia Learning
Sophia: Interior and Exterior Angles of Polygons
Interior and exterior angles of polygons are investigated in this geometry resource. Definitions and video lessons are included.
Sophia Learning
Sophia: Proof (Harder)
This geometry resource discusses two types of proof. Video lessons demonstrating a flow proof and a two-column proof are included.
Sophia Learning
Sophia: Torque Defined Mathematically
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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