# Geometry A

Goals

1. Foundations of Geometry

• I will be able to see the important role that logic plays in our lives.
• I will learn to develop airtight arguments, and prove that I’m right.

2. Triangles

• I will be able to identify when triangles are similar (scaled up or down) and when triangles are congruent (exactly the same shape and size).
• I will be able to use the properties of triangle angles and altitudes to calculate the distance to far-away objects.

3. Right Triangles

• I will be able to identify right triangles and special right triangles (30-60-90 and 45-45-90).
• I will be able to apply the Pythagorean theorem to find missing sides and angles of right triangles.
• I will be able to identify and use postulates SSS, SAS, ASA to prove congruence.

4. Trigonometry

• I will learn what SOH CAH TOA means and how to use it to find missing angle measures and side lengths.
• I will be able to use two methods to solve for missing parts of oblique triangles (the law of cosines and the law of sines).
• I will be able to solve problems involving all kinds of triangles, not just right ones.

• I will be able to identify shapes in the real world.
• I will learn the names of polygons, and how to find their perimeters, areas, and angles.
• I will be able to draw diagonals and interior triangles, and identify patterns.
• I will be able to identify quadrilaterals (four-sided polygons), as well as parallelograms, rhombi, squares, and rectangles.

6. Circles Without Coordinates

• I will learn how to calculate the area of a circle.
• I will be able to identify the properties, and measure, the parts of a circle, such as radii, diameters, arcs, and intercepted angles.
• I will be able to use inscribed angles and polygons to calculate angles within a circle formed by chords, secants, and tangents.