Defines the Pythagorean Theorem, and demonstrates how to use this Theorem in connection with right-angled triangles.

[Free Registration/Login may be required to access all resource tools.] Apply the Pythagorean Theorem and its converse. Includes videos, exercises, links to interactive activities, etc.

Students are introduced to concepts taught in trigonometry. The tutorial consists of notes and examples.

A short interactive activity to prove that a triangle inscribed in a semicircle is right-angled.

A geometric model that proves the Pythagorean Theorem in a step-by-step diagram that students can advance at their own pace. Requires Java.

A map from 1903 of New Hampshire showing the capital of Concord, counties and county seats, principal cities and towns, railroads, rivers, and mountain ranges. "New Hampshire, one of the New England States of the American Union, lies...