Outside the Box Geometry
# Introduction

These three quizzes introduce geometry through interesting topics and challenging puzzles. This course contains many of each of these types of problems:

**Angle Hunting**: using the axioms for angle-geometry to figure out the value of an unknown angle**Strategic Geometry**: going beyond the basic skills to solve complex problems and to master more challenging techniques and proofs**Beautiful Explorations**: diving deeply into areas of geometry where the elegance and beauty speaks for itself

What is the measure of the green angle, \(\angle A?\)

**Find the measure of the red angle marked \(x\) below.**

Hint: Trying sliding two lines; shifting a line (without rotating it) doesn’t change the angle of its intersection with other lines.

What can we say about the base angles of any isosceles triangle?

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