Triangles
Gujarat Board · Class 9 · Mathematics
Flashcards for Triangles — Gujarat Board Class 9 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.
What are congruent figures? Give an example from daily life.
Answer
Congruent figures are figures that have the same shape and the same size. They can be placed on each other to cover completely. Examples: Two coins of same denomination, two bangles of same size, moul
When are two triangles said to be congruent?
Answer
Two triangles are congruent if all corresponding sides and all corresponding angles are equal. This means one triangle can be placed exactly over the other to cover it completely. We write △ABC ≅ △PQR
What does CPCT stand for and what does it mean?
Answer
CPCT stands for 'Corresponding Parts of Congruent Triangles'. It means that if two triangles are congruent, then their corresponding sides are equal and their corresponding angles are equal.
State the SAS congruence rule.
Answer
SAS (Side-Angle-Side) Congruence Rule: Two triangles are congruent if two sides and the included angle of one triangle are equal to the two sides and the included angle of the other triangle. The angl
State the ASA congruence rule.
Answer
ASA (Angle-Side-Angle) Congruence Rule: Two triangles are congruent if two angles and the included side of one triangle are equal to two angles and the included side of the other triangle. The side mu
What is the AAS congruence rule?
Answer
AAS (Angle-Angle-Side) Congruence Rule: Two triangles are congruent if any two pairs of angles and one pair of corresponding sides are equal. This works because if two angles are equal, the third angl
Why is equality of three angles not sufficient for triangle congruence?
Answer
Equality of three angles is not sufficient for congruence because triangles with same angles can have different sizes. For example, all triangles with angles 40°, 50°, and 90° are similar but not nece
What is an isosceles triangle? State its important property.
Answer
An isosceles triangle is a triangle in which two sides are equal. Important property: In an isosceles triangle, the angles opposite to the equal sides are equal. If AB = AC, then ∠B = ∠C.
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Triangles covers several key topics that are frequently asked in Gujarat Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
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There are 22 flashcards for Triangles covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.
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