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CBSE Class 9 Answered

qus 1  - ABCD is trapezium with parallel sides AB = a and DC = b. if E and F are mid points of non parallel sides AD and BC respectively, then find the ratio of areas of quadrilaterals ABFE and EFCD.
 
 
qus2 - ABCD is a rectangle with O as any point in its interior. if ar ( triangle AOD) = 3sq. cm and ar ( triangle BOC) = 6sq. cm, then find the area of rectangle ABCD.
 
 
Asked by Varsha | 24 Jan, 2015, 08:17: PM
answered-by-expert Expert Answer
L e t space l e n g t h space o f space t h e space r e c tan g l e space b e space apostrophe a subscript 1 plus a subscript 2 apostrophe. B r e a d t h space o f space t h e space r e c tan g l e space b e space b. A r e a space o f space increment A O D equals space 1 half cross times b cross times a subscript 1 rightwards double arrow 3 equals space 1 half cross times b cross times a subscript 1 rightwards double arrow a subscript 1 b equals 6 space c m squared A r e a space o f space increment B O C equals 1 half cross times b cross times a subscript 2 rightwards double arrow 6 equals 1 half cross times b cross times a subscript 2 rightwards double arrow a subscript 2 b equals 12 space c m squared left parenthesis i right parenthesis plus left parenthesis i i right parenthesis rightwards double arrow a subscript 1 b plus a subscript 2 b equals 18 space A r e a space o f space t h e space r e c tan g l e equals left parenthesis a subscript 1 plus a subscript 2 right parenthesis b equals 18 space c m squared A r e a space o f space t h e space r e c tan g l e space A B C D equals 18 space c m squared
Answered by Prasenjit Paul | 26 Jan, 2015, 03:03: AM

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