tailieunhanh - The gre anlytycal writting section 9

Tham khảo tài liệu 'the gre anlytycal writting section 9', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | THE GRE QUANTITATIVE SECTION A right angle is an angle that measures exactly 90 degrees. A right angle is sumbolized by a square at the vertex. An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. A straight angle is an angle that measures 180 degrees. Thus both its sides form a line. Straight Angle 180 Complementary Angles Two angles are complimentary if the sum of their measures is equal to 90 degrees. 180 THE GRE QUANTITATIVE SECTION Supplementary Angles Two angles are supplementary if the sum of their measures is equal to 180 degrees. Adjacent Angles Adjacent angles have the same vertex share a side and do not overlap. Z1 and Z2 are adjacent The sum of all possible adjacent angles around the same vertex is equal to 360 degrees. Angles of Intersecting Lines When two lines intersect vertical angles are formed. Vertical angles have equal measures and are supplementary to adjacent angles. 181 THE GRE QUANTITATIVE SECTION mZ1 mZ3 and mZ2 mZ4 mZ1 mZ2 180 and mZ2 mZ3 180 mZ3 mZ4 180 and mZ1 mZ4 180 Bisecting Angles and Line Segments Both angles and lines are said to be bisected when divided into two parts with equal measures. Example A bisector Therefore line segment AB is bisected at point C. According to the figure ZA is bisected by ray AC. .