**Intermediate mathematics**- Perform mathematical calculations utilizing basic algebra (fundamental laws, algebraic expressions), geometry, and the trigonometric functions of right triangles.- Basic Algebra Skills [Video] This video illustrates the basic rules of Algebra.
- Proportion Basics A proportion is a special form of an algebra equation. It is used to compare two ratios or make equivalent fractions. A ratio is a comparison between two values.
- The Fundamental Rule of Proportions [Video] This video illustrates how to solve problems using the fundamental rule of proportions - cross-multiplication.
- Finding an Angle in a Right Angled Triangle We can find an unknown angle in a right-angled triangle, as long as we know the lengths of two of its sides.
- Solving Right Triangles This is a topic in traditional trigonometry. It does not come up in calculus.
- The Pythagorean Theorem Use the Pythagorean Theorem to find the unknown side of a right triangle.
- Building Blocks of Geometry [Video] Learn how to understand and identify the undefined terms point, line and plane. Define segment, ray, angle, collinear, intersect, intersection and coplaner., Investigate postulates about points, lines and planes.
- Introduction to Trigonometric Functions [Video] A brief lesson on trigonometric functions: sine, cosine, and tangent.
- ETT Level 1: Mathematics (Review) Solve basic math problems, calculate percentage, read graphs, and use simple geometric formulas.

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