This is the picture of a car's taillight. This picture was taken on a street in Orlando (I can't recall exactly where we were (I think we were at Wendy's but not completely sure)).
Area under a Curve
Angle in a semi-circle
Video 1 - Geogebra Project - Cameron King
Transformations Lesson 4 WS 1.2
The 9-point Conic
Curve Stitching with Semicircles 2