Tham khảo tài liệu 'algebal review 8', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | GEOMETRY REVIEW Practice Question 30 If the two polygons above are similar what is the value of d a. 2 b. 5 c. 7 d. 12 e. 23 Find cross products. 5 12 60 60 30 2 Answer a. The two polygons are similar which means the ratio of the corresponding sides are in proportion. Therefore if the ratio of one side is 30 5 then the ration of the other side 12 d must be the same. Solve for d using proportions 30d 30d d d Parallelograms A parallelogram is a quadrilateral with two pairs of parallel sides. In the figure above AB DC and AD BC. Parallelograms have the following attributes opposite sides that are equal AD BC aB DC opposite angles that are equal mZA mZC mZB mZD consecutive angles that are supplementary mZA mZB 180 mZB mZC 180 mZC mZD 180 mZD mZA 180 129 GEOMETRY REVIEW Special Types of Parallelograms A rectangle is a parallelogram with four right angles. AD BC AB DC A rhombus is a parallelogram with four equal sides. AB BC DC AD A square is a parallelogram with four equal sides and four right angles. AB BC DC AD mZA mZB mZC mZD 90 Diagonals A diagonal cuts a parallelogram into two equal halves. A B D C AABC AADC 130 GEOMETRY REVIEW In all parallelograms diagonals cut each other into two equal halves. A B AE CE DE BE D C In a rectangle diagonals are the same length. AB AC DB D C In a rhombus diagonals intersect at right angles. In a square diagonals are the same length and intersect at right angles. .
