In this Early Edge video lesson, you'll learn more about Complementary and Supplementary Angles, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Types of Angles, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

Similar triangles  all three corresponding angles the same. AAA
Math Open Reference

Definition of an acute angle (one less than 90 degrees).
Math Open Reference

Definition of 'altitude' and the various different ways the word is used in geometry
Math Open Reference

Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.
Online Math Learning

Identify the missing angle measurement in each set of supplementary angles. Answers included.
MathDrills.com

Identify the missing angle measurement in each set of complementary angles. Answers included.
MathDrills.com

This website is a worksheet to estimate and measure angles. The answer sheet is there also.
MathDrills.com

Explanation of acute angles
Math is Fun
