Chapter Exam

Chapter-4 Geometry — Online MCQ Test

Q: In a triangle, if two sides are equal, what is the triangle called?

Answer: B. Isosceles triangle — A triangle with exactly two equal sides is called an isosceles triangle.

Q: The sum of the interior angles of a quadrilateral is:

Answer: D. 360° — A quadrilateral can be divided into two triangles, so the sum of its interior angles is 360°.

Q: In an isosceles triangle, the angles opposite the equal sides are:

Answer: A. Always equal — By the base angles theorem, angles opposite equal sides in an isosceles triangle are equal.

Q: Which of the following is NOT a property of a cyclic quadrilateral?

Answer: C. One pair of opposite sides are equal — A cyclic quadrilateral has all its vertices on a circle and opposite angles supplementary, but opposite sides need not be equal.

Q: A triangle has angles in the ratio 2 : 3 : 4. What is the largest angle?

Answer: C. 80° — The angles sum to 180°. The ratio parts total 9, so each part is 20°. The largest angle is 4 × 20° = 80°.

MATHS · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-4 Geometry with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th MATHS. This chapter covers: Description Explains theorems related to triangles quadrilaterals circles and geometric constructions Keywords Triangles Quadrilaterals Circles Theorems Constructions. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-4 Geometry — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th MATHS — Chapter-4 Geometry, with answers and explanations. These are sample questions; the exam has its own separate question set.

In a triangle, if two sides are equal, what is the triangle called?

A. Scalene triangle
B. Isosceles triangle ✓
C. Equilateral triangle
D. Right triangle

Answer: B. Isosceles triangle
A triangle with exactly two equal sides is called an isosceles triangle.

The sum of the interior angles of a quadrilateral is:

A. 90°
B. 180°
C. 270°
D. 360° ✓

Answer: D. 360°
A quadrilateral can be divided into two triangles, so the sum of its interior angles is 360°.

In an isosceles triangle, the angles opposite the equal sides are:

A. Always equal ✓
B. Always 90°
C. Always obtuse
D. Always supplementary

Answer: A. Always equal
By the base angles theorem, angles opposite equal sides in an isosceles triangle are equal.

Which of the following is NOT a property of a cyclic quadrilateral?

A. Opposite angles are supplementary
B. All vertices lie on a circle
C. One pair of opposite sides are equal ✓
D. It can be inscribed in a circle

Answer: C. One pair of opposite sides are equal
A cyclic quadrilateral has all its vertices on a circle and opposite angles supplementary, but opposite sides need not be equal.

A triangle has angles in the ratio 2 : 3 : 4. What is the largest angle?