Daily Practice Problems

Class 9 · Maths

Ch 7 — Triangles

📅 8 August 2026 ✎ 5 Questions ⏰ 10 minutes

If two triangles are congruent (≅), then their corresponding sides are:

A. proportional B. equal C. parallel D. perpendicular

📝 SolutionCongruent triangles: identical shape and size, all corresponding sides equal, all corresponding angles equal.

SSS congruence criterion means:

A. all angles equal B. all three sides equal C. two angles equal D. one side and two angles

📝 SolutionSSS (Side-Side-Side): if all three sides of one triangle equal corresponding sides of another, triangles are congruent.

In isosceles triangle ABC with AB = AC, the angles at B and C are:

A. 90° each B. equal to each other C. different D. not determined

📝 SolutionIsosceles triangle theorem: if two sides are equal, the angles opposite to them are also equal (base angles).

Basic Proportionality Theorem (Thales) states:

A. all sides are equal B. a line parallel to one side divides other sides in same ratio C. all angles are equal D. area is constant

📝 SolutionIf a line parallel to one side of triangle intersects other two sides, it divides them in the same ratio.

CPCT stands for:

A. Corresponding Parts of Congruent Triangles B. Constant Proportional Corresponding Triangles C. Circular Plane Containing Triangles D. none

📝 SolutionCPCT: if two triangles are congruent, then all their corresponding parts (sides and angles) are congruent.

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Class 9 · Maths

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