Triangles — Flashcards
Gujarat Board · Class 9 · Mathematics
22 flashcards for Triangles (Gujarat Board Class 9 Mathematics) to test yourself on key terms and facts. Sample: "What are congruent figures? Give.
Interactive on Super Tutor
Studying Triangles? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
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.
+14 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Triangles for Gujarat Board Class 9 Mathematics?
How many flashcards are available for Triangles?
How should I revise Triangles for Class 9 exams?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Triangles
For serious students
Get the full Triangles chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for Gujarat Board Class 9 Mathematics. Free to start, no card needed.