All lessons › Unit 6 · Geometry and trigonometry

Lines, angles and polygons

There is less geometry on the Digital SAT Math section than algebra, but it shows up regularly. Many questions use angles, like angles made by parallel lines or the sum of angles in a polygon.

This lesson reviews angle types, angles from parallel lines, and angles in triangles and polygons. Animated pictures show which angles are equal and why. Each part has a quiz, and the practice questions mix the angle rules. Small pictures show each rule before you use it, and every answer is explained in plain words. You can finish the lesson one short part at a time.

In this lesson

• Angles and parallel lines
• Triangles and polygons