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Trigonometry By Dave & Ron Identifying Triangles By Sides Iscoceles Equilateral Scalene Right Determining Isosceles Isosceles Triangles will have 2 equal sides, and one unequal. For example, Two sides are 8meters long, And the base is 14meters Determining Equilateral An equilateral triangle is a triangle with all equal sides, hence the name Equilateral. Determining Scalene Scalene Triangle’s have no equal sides. They’re all congruent, and each angle is equal to 60º! QuickTime™ and a decompressor are needed to see this picture. Determining Right Triangles Its easy, there are 3 sides to a right triangle. The legs, which are straight, and the hypotenuse is a diagonal line. The angle of the 2 legs is ALWAYS equal to 90 degrees. QuickTime™ and a decompressor are needed to see this picture. Identifying Triangles by Angles Obtuse Acute Right Identifying Obtuse Angles An Obtuse angle is an angle of a triangle over 90 degrees. QuickTime™ and a decompressor are needed to see this picture. Identifying Acute Angles Acute angles are tiny angles, smaller/less than 90 degrees, QuickTime™ and a decompressor are needed to see this picture. Identifying Right Angles All right triangles will have right angle the right angle as said before always has a 90 degree angle. QuickTime™ and a decompressor are needed to see this picture. Special Rules/Tips & Tricks There are a few special rules you ought to remember when dealing with isosceles and/or equilateral triangles. They are outlined below. 1. If a triangle is equilateral, it is equiangular. 2. If two angles of a triangle are congruent, they are the base angles of an isosceles triangle. 3. If a triangle is equiangular, it is equilateral. Pythagorean Theory If you have to find the Hypotenuse: Square The Sides, And then add them, And then find the square root of your result. If youre looking for a leg, Square the Hypotenuse, And the and the leg, then just subtract the larger one to the smaller one then square your result and that’s the leg. REVIEW! Isosceles: 2 Equal Sides Scalene: No Equal Sides Right: 90 Degree Angle Equilateral: All Equal Sides Obtuse: >90º Acute: <90º Right: 90º