Fill in the blanks by using the correct word given in brackets.
(i) All circles are ……………. . (congruent/similar)
(ii) All squares are …………… . (similar/congruent)
(iii) All …………….. triangles are similar. (isosceles/equilateral)
(iv) Two polygons of the same number of sides are similar, if
(a) their corresponding angles are …………… and
(b) their corresponding sides are …………… (equal/proportional)
CBSE Class 10 Triangles — Complete Guide
Triangles carries the highest marks in Geometry (8-10 marks). BPT proof and Pythagoras theorem proof are must-prepare topics.
Quick Revision: Key Concepts
- BPT: If DE ∥ BC, then AD/DB = AE/EC
- Similarity criteria: AA, SSS, SAS
- Area ratio: ar(▵1)/ar(▵2) = (side ratio)²
- Pythagoras: hypotenuse² = base² + perpendicular²
Most Important Questions
- Prove BPT (Thales' theorem) — 5 marks guaranteed
- Prove Pythagoras theorem using similarity
- Prove triangles are similar using AA/SSS/SAS and find unknown sides
- Area ratio problems
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