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Description of Standard: Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.

Minimizing the Perimeter of a Sector with Given Area	Problems on Circles V: External and Internal Common Tangents	Geometric Elements of a Circle	Areas of the Lens and Two Lunes of Two Intersecting Circles	Minimum Area between a Semicircle and a Rectangle
The Area of Part of an Isosceles Triangle	Angular Displacement	Pairwise Tangent Circles Centered at the Vertices of a Triangle	Tangent Chord Angle	Angles Measured in Degrees and Radians