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Tham khảo tài liệu 'the gre anlytycal writting section 10', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | THE GRE QUANTITATIVE SECTION mZ1 mZ3 mZ5 mZ4 mZ2 mZ5 mZ6 mZ3 mZ2 The sum of the exterior angles of a triangle equal to 360 degrees. Triangles More geometry questions on the GRE pertain to triangles than to any other topic. The following topics cover the information you will need to apply when solving triangle problems. Classifying Triangles It is possible to classify triangles into three categories based on the number of equal sides Scalene Triangle no equal sides Isosceles Triangle at least two equal sides Equilateral Triangle all sides equal 185 THE GRE QUANTITATIVE SECTION It is also possible to classify triangles into three categories based on the measure of the greatest angle Acute Triangle greatest angle is acute Right Triangle greatest angle is 90 degrees Obtuse Triangle greatest angle is obtuse Angle-Side Relationships Knowing the angle-side relationships in isosceles equilateral and right triangles will be useful when you take the GRE. In isosceles triangles equal angles are opposite equal sides. 186 THE GRE QUANTITATIVE SECTION In equilateral triangles all sides are equal and all angles are equal. Equilateral In a right triangle the side opposite the right angle is called the hypotenuse. The hypotenuse is the longest side of the triangle. Right Pythagorean Theorem The Pythagorean theorem is an important tool for working with right triangles. It states a2 b2 c2 where a and b represent the length of the legs and c reprecents the length of the hypotenuse. This theorem allows you to find the length of any side as long as you know the measure of the other two. a2 b2 c2 12 22 c2 1 4 c2 5 c2 V5 c .