Chapter-4 Geometry — Online MCQ Test
MATHS · Samacheer Kalvi 9th · Tamil Nadu State Board
Practice Chapter-4 Geometry with a free chapter-wise online MCQ test.
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.
Chapter-4 Geometry — Important Questions & Answers
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.
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°.
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.
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 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?
- A. 40°
- B. 60°
- C. 80°
- D. 100°
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°.
The angles sum to 180°. The ratio parts total 9, so each part is 20°. The largest angle is 4 × 20° = 80°.