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P and Q are mid points of AB and AC of ΔABC. Which of the following is not true? - Mathematics

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Question

P and Q are mid points of AB and AC of ΔABC. Which of the following is not true?

Options

  • Area of ΔBQC = Area of ΔBPC

  • Area of ΔPBQ = Area of ΔPCQ

  • Area of ΔAPQ = Area of ΔBOC

  • Area of ΔABQ = Area of ΔBQC

MCQ
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Solution

Area of ΔAPQ = Area of ΔBOC

Explanation:

We are given:

  • ΔABC, with P and Q as midpoints of AB and AC
  • We need to find which statement is not true.

Step 1: Recall the midpoint theorem

  • Line joining midpoints of two sides = parallel to third side and half its length
  • So PQ || BC and PQ = `1/2` BC

Step 2: Compare areas of triangles

1. ΔBQC = ΔBPC

  • Both triangles share BC as base and lie between same parallels (height from B or C).
  • So Area(ΔBQC) = Area(ΔBPC) true

2. ΔPBQ = ΔPCQ

  • Both triangles share vertex Q and line segments connecting midpoints.
  • By symmetry, Area(ΔPBQ) = Area(ΔPCQ) true

3. ΔAPQ and ΔBOC

  • ΔAPQ is small triangle at top (formed by connecting midpoints)
  • ΔBOC is large triangle at bottom
  • Clearly, ΔAPQ is smaller than ΔBOC
  • So Area(ΔAPQ) ≠ Area(ΔBOC) not true

4. ΔABQ and ΔBQC

  • Both share height from B or C and respective bases along triangle sides
  • By midpoint theorem and proportionality, areas are equal true
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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 8. | Page 164
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