TAILIEUCHUNG - Arithmatic english 5

Tham khảo tài liệu 'arithmatic english 5', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | GEOMETRY Angles Two rays with a common endpoint called a vertex form an angle. The following figures show the different types of angles Acute The measure is between 0 and 90 degrees. Right The measure is equal to 90 degrees. The measure is between 90 and 180 degrees. Straight The measure is equal to 180 degrees. Here are a few tips to use when determining the measure of the angles. A pair of angles is complementary if the sum of the measures of the angles is 90 degrees. A pair of angles is supplementary if the sum of the measures of the angles is 180 degrees. If two angles have the same measure then they are congruent. If an angle is bisected it is divided into two congruent angles. Lines and Angles When two lines intersect four angles are formed. 358 -------------------------------------- GEOMETRY ------------------------------------------- Vertical angles are the nonadjacent angles formed or the opposite angles. These angles have the same measure. For example m z 1 m z 3 and m z 2 m z 4. The sum of any two adjacent angles is 180 degrees. For example m z 1 m z 2 180. The sum of all four of the angles formed is 360 degrees. If the two lines intersect and form four right angles then the lines are perpendicular. If line m is perpendicular to line n it is written m n. If the two lines are in the same plane and will never intersect then the lines are parallel. If line l is parallel to line p it is written l p. Parallel Lines and Angles Some special angle patterns appear when two parallel lines are cut by another nonparallel line or a transversal. When this happens two different-sized angles are created four angles of one size and four of another size. Corresponding angles. These are angle pairs 1 and 5 2 and 6 3 and 7 and 4 and 8. Within each pair the angles are congruent to each other. Alternate interior angles. These are angle pairs 3 and 6 and 4 and 5. Within the pair the angles are congruent to each other. Alternate exterior angles. These are angle pairs 1 and 8 .

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