Exercise 6.1: Similar figures
What it tests. Two polygons with the same number of sides are similar when their corresponding angles are equal and their corresponding sides are in the same ratio. Both conditions are needed (except for triangles).
NCERT Solutions for Class 10 Maths Chapter 6: Triangles
Similar figures, the Basic Proportionality Theorem (Thales) and its converse, and the AAA, SSS and SAS similarity criteria. Our own step-by-step solutions to Exercises 6.1 to 6.3, one page per exercise, set out for step marks.
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Chapter 6 exercises
Each exercise has its own page with every question solved step by step. Pick the one you are on.
Exercise 6.2: Basic Proportionality Theorem and its converse
What it tests. BPT: a line parallel to one side of a triangle, cutting the other two sides, divides them in the same ratio: \(\dfrac{AD}{DB} = \dfrac{AE}{EC}\). Converse: if a line divides two sides in the same ratio, it is parallel to the third side.
Exercise 6.3: Criteria for similarity of triangles
What it tests. AAA (or AA): two angles equal. SSS: all three sides in the same ratio. SAS: one angle equal and the sides including it in the same ratio. Always write the vertices in corresponding order.
Done the NCERT exercises? The board paper asks more
Triangles has 40 original board-style questions (MCQ, assertion–reason, short and long answers, case studies) with step mark schemes, revision notes and a four-step Route to 95. Three sample questions are open to everyone; a free account opens the rest.
Also useful: free MCQs and case studies for Triangles · Class 10 formula sheet · official CBSE board and sample papers · our sample papers with marking scheme · the Route to 95 plan
Textbook: NCERT Mathematics Class 10 (rationalised edition, 2023-24 reprint onward), free from ncert.nic.in. Question statements are shortened to the minimum needed; the solutions and tips are our own. CBSE Math Revision is independent and not affiliated with NCERT or CBSE. Spotted a slip? Tell us and it goes in the corrections log.