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If in two triangles Δ DEF and Δ… (Class 10 Maths 2025, Q10)

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MathsCBSE Class 10 · Standard · Board exam 2025, set 30/3/1 · 1 mark · MCQ

CBSE Class 10 Mathematics Standard 2025: question 10

Set in the CBSE Class 10 board exam of 2025, paper 30/3/1, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQTriangles

If in two triangles DEF and PQR, D Q and R E, then which of the following is not true ?

  1. (A)
  2. (B)
  3. (C)
  4. (D)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 30/3/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Match vertices with equal angles to get the correspondence.

Hint 2

Check which option compares non-corresponding sides.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. , , so (D↔Q, E↔R, F↔P), giving .

    ½ mark

  2. (A), (B), (C) follow from this; (D) pairs DE with PQ, which is not a corresponding side, so (D) is not true.

    ½ mark

Answer: Option (D)

Where the marks are

  • Correct correspondence DEF ↔ QRP (½ mark)
  • Identifies (D) as false (½ mark)

Revise the chapter

  • Chapter: Triangles (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Triangles, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 30/3/1 (Standard): every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.