Watch Video on Similar Triangles - Geometry Help
Thursday, September 10th, 2009
Access full lesson containing this video at: http://www.yourteacher.com/geometry/similartriangle.php Students learn that similar polygons have the same shape, and if two polygons are similar, then the corresponding angles are congruent, and the corresponding sides are in proportion. Students also learn that the scale factor is ratio of the lengths of two corresponding sides. Students are then asked to use these concepts to find missing angle measures and missing side lengths in similar figures.
Duration : 0:3:0
10-14, similar triangles
Access full lesson containing this video at: http://www.yourteacher.com/geometry/306090triangles.php Students are asked to solve advanced problems using the 45°-45°-90° and 30°-60°-90° triangle formulas, such as finding the missing parts of a rhombus, a trapezoid, or an equilateral triangle.
Access full lesson containing this video at: http://www.yourteacher.com/geometry/pythagoreantheorem.php Students learn the Pythagorean Theorem, which states that the sum of the squares of the lengths of the legs of a right triangle is equal to the square of the length of the hypotenuse, or a^2 + b^2 = c^2. Students are then asked to find missing side lengths of right triangles using the Pythagorean Theorem.
Access full lesson containing this video at: http://www.yourteacher.com/geometry/areaoftriangle.php Students learn the formula for the area of a triangle, and are asked to solve problems using this formula. Note that right triangle formulas and trigonometry are used extensively in the problems in this lesson.