Sophia Learning
Sophia: Two Lines Tangent to a Circle: Lesson 2
This lesson will present how if two segments from the same point outside a circle are tangent to a circle, then they are congruent. It is 2 of 5 in the series titled "Two Lines Tangent to a Circle."
Khan Academy
Khan Academy: Composing Shapes
Shows how shapes can be put together to make new shapes. [2:04]
Sophia Learning
Sophia: Building Composite Shapes: Lesson 1
This lesson demonstrates how to create composite shapes by combining other shapes. It is 1 of 10 in the series titled "Building Composite Shapes."