This document covers geometry problems related to tangent lines, circles, and perimeter calculations. It includes exercises on determining tangency, finding unknown values, and calculating perimeters in various geometric configurations.

Key points:

• Problems involve determining if lines are tangent to circles

• Exercises on finding unknown values in tangent-related scenarios

• Perimeter calculations for shapes involving circles and tangent lines

• Application of Pythagorean theorem and algebraic equations to solve problems