Triangles: Class 10 Mathematics (गणित) (Bihar Board) important questions and practice
Triangles is chapter 6 of 14 in Bihar Board Class 10 Mathematics (गणित). Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Similar figures and similar triangles
- Basic Proportionality Theorem (Thales) and its converse
- Criteria for similarity: AAA, SSS, SAS
- Problems using similarity to find lengths
- Applications: shadows, ladders and heights
What examiners usually ask
- State and prove the Basic Proportionality Theorem
- In the figure, DE is parallel to BC; if AD = 1.5 cm, DB = 3 cm and AE = 1 cm, find EC
- Prove that the ratio of corresponding sides of two similar triangles is equal to the ratio of their altitudes
Exam tip
The BPT proof with figure and construction is the standard 5-mark question; write the 'given, to prove, construction, proof' structure and name the similarity criterion (AA, SAS) each time you use it.
Triangles on other boards and exams
Frequently asked questions
What are the important questions from Triangles for Bihar Board Class 10?
The question types listed above repeat most often in Bihar Board Class 10 Mathematics (गणित) papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Triangles in the Bihar Board Class 10 Mathematics (गणित) syllabus?
Yes. Triangles is part of the current Bihar Board Class 10 Mathematics (गणित) syllabus, as listed on this site from the prescribed textbook.
Can I practise Triangles MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.