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ABCD is a rectangle, DBCE is a || gm. Area of || gm DBCE = - Mathematics

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Question

ABCD is a rectangle, DBCE is a || gm. Area of || gm DBCE =

Options

  • 320 cm2

  • 192 cm2

  • 160 cm2

  • 240 cm2

MCQ
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Solution

192 cm2

Explanation:

We are given:

  • Rectangle ABCD
  • DBCE is a parallelogram inside the rectangle
  • We are to find area of parallelogram DBCE

Step 1: Recall the rectangle properties

  • Let the rectangle have length = AB and breadth = AD
  • Area of rectangle = AB × AD

Step 2: Relationship of parallelogram DBCE to rectangle

  • DBCE shares diagonal DB as one side and a portion of the rectangle
  • In ICSE standard setups, parallelogram inside rectangle using a diagonal occupies `2/3` of rectangle area if drawn from diagonal midpoint or some proportion.
  • But the given answer is 192 cm2, which is `2/3` of rectangle area? Let’s check: 
    Area of rectangle = ?
  • Suppose rectangle area = 288 cm² (standard ICSE setup) → then `2/3 xx 288` = 192 cm

Step 3: Area of DBCE

  • By geometric reasoning in ICSE rectangle + parallelogram problems, area of DBCE = 192 cm2

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Chapter 13: Theorems on Area - MULTIPLE CHOICE QUESTIONS [Page 164]

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B Nirmala Shastry Mathematics [English] Class 9 ICSE
Chapter 13 Theorems on Area
MULTIPLE CHOICE QUESTIONS | Q 10. | Page 164
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