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ICSE Class 6 Answered

The area of a rectangle is 768 sq cm if the length and breath  are in ratio of 4:3  find length ,breath , and perimeter
Asked by Ritu | 11 Sep, 2016, 08:26: PM
answered-by-expert Expert Answer
begin mathsize 16px style Let space the space common space multiple space be space apostrophe straight x apostrophe. So comma space the space length space and space breadth space of space the space rectangle space be space 4 straight x space and space 3 straight x space respectively. Area space of space the space rectangle equals length space cross times space breath space rightwards double arrow 768 equals space 4 straight x space cross times 3 straight x rightwards double arrow 768 equals space 12 straight x squared rightwards double arrow straight x squared equals 768 over 12 rightwards double arrow straight x squared equals 64 rightwards double arrow straight x equals 8 So comma space the space length equals 4 straight x equals 4 left parenthesis 8 right parenthesis equals 32 space cm breadth space equals space 3 left parenthesis 8 right parenthesis space equals space 24 space cm perimeter space of space the space rectangle space equals space 2 left parenthesis length space plus space breadth right parenthesis space equals space 2 space left parenthesis 32 space plus space 24 right parenthesis space equals space 2 space left parenthesis 56 right parenthesis space equals space 112 space cm. space end style
Answered by Rebecca Fernandes | 11 Sep, 2016, 08:42: PM
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