Chapter Exam

Chapter-4 Geometry — Online MCQ Test

Q: How many sides does a quadrilateral have?

Answer: B. 4 — A quadrilateral is a polygon with 4 sides. Its interior angles also add up to 360°.

Q: Which of the following is a triangle with all three sides equal?

Answer: C. Equilateral triangle — An equilateral triangle has all three sides equal and all three angles equal to 60°.

Q: A quadrilateral has three angles 90°, 85°, and 95°. What is the fourth angle?

Answer: C. 90° — The sum of angles in a quadrilateral is 360°. So the fourth angle = 360° - (90° + 85° + 95°) = 90°.

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

Answer: B. 30° — Let the angles be 2x, 3x, and 4x. Then 9x = 180°, so x = 20° and the smallest angle is 2x = 40°.

Q: A quadrilateral has opposite sides equal and one pair of opposite angles equal. Which quadrilateral is it most likely to be?

Answer: B. Parallelogram — A parallelogram has both pairs of opposite sides equal and opposite angles equal. These are standard identifying properties.

MATHS · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-4 Geometry with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th MATHS. This chapter covers: quadrilaterals triangles constructions Explains properties of quadrilaterals triangles and geometric 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 8th MATHS — Chapter-4 Geometry, with answers and explanations. These are sample questions; the exam has its own separate question set.

How many sides does a quadrilateral have?

A. 3
B. 4 ✓
C. 5
D. 6

Answer: B. 4
A quadrilateral is a polygon with 4 sides. Its interior angles also add up to 360°.

Which of the following is a triangle with all three sides equal?

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

Answer: C. Equilateral triangle
An equilateral triangle has all three sides equal and all three angles equal to 60°.

A quadrilateral has three angles 90°, 85°, and 95°. What is the fourth angle?

A. 80°
B. 85°
C. 90° ✓
D. 100°

Answer: C. 90°
The sum of angles in a quadrilateral is 360°. So the fourth angle = 360° - (90° + 85° + 95°) = 90°.

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

A. 20°
B. 30° ✓
C. 40°
D. 50°

Answer: B. 30°
Let the angles be 2x, 3x, and 4x. Then 9x = 180°, so x = 20° and the smallest angle is 2x = 40°.

A quadrilateral has opposite sides equal and one pair of opposite angles equal. Which quadrilateral is it most likely to be?

A. Trapezium
B. Parallelogram ✓
C. Rhombus
D. Kite

Answer: B. Parallelogram
A parallelogram has both pairs of opposite sides equal and opposite angles equal. These are standard identifying properties.

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