After reviewing types of angles and how to measure angles using a protractor, students will see how many triangles they can construct using an 18-foot beam.  Through this activity, students will discover the conditions that must be met to construct a triangle.  For example, the sum of the lengths of two sides of a triangle must be greater than the longest side of the triangle.  They will also discover that the sum of the angles of a triangle is always 180 degrees.

An interactive applet and associated web page that demonstrate a right angle (those equal to 90 deg). The applet presents an angle (initially 90 deg) that the user can adjust by dragging the end points of the line segments forming the angle. As it changes it shows the angle measure and a message that indicate which type of angle it is. There a software 'detents' that make it easy capture exact angles such as 90 degrees and 180 degrees The message and angle measures can be turned off to facilitate classroom discussion. The text on the page has links to other pages defining each angle type in depth. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Description of cosine function with image, calculation of length of hypotenuse with known angle and adjacent side, calculation of angle with known adjacent and hypotenuse sides. Explanation of inverse cosine. Interactive fill in the blank of main points.

Image of real life project using Pythagorean Theorem. Definition of theorem, directions with images on how to use theorem to square a construction project.

Description of trig functions with examples, table of equations, SOHCAHTOA acronym for help in recognizing functions, drag a

Course presentation showing relationship of sine and cosine of angles in a right triangle

Description of sine function with image, calculation of length of hypotenuse with known angle and opposite side, calculation of angle with known opposite and hypotenuse sides. Explanation of inverse sine. Interactive fill in the blank of main points.

Description of tangent function with image, calculation of length of opposite side with known angle and adjacent side, calculation of angle with known opposite and adjacent sides. Explanation of inverse tangent Interactive fill in the blank of main points.

Trigonometry ratios of right triangle, image of right triangle with hypotenuse, opposite, and adjacent sides labeled with hotspot information. Interactive Drag and drop image of labeling sides of right triangle

This link goes to an interactive orchestra you can use with any age group. It breaks it down into the instrument families and then by instrument. (Conductor included)