Chapter-4 Geometry — Online MCQ Test
MATHS · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-4 Geometry with a free chapter-wise online MCQ test.
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.
Chapter-4 Geometry — Important Questions & Answers
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°.
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°.
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°.
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°.
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.
A parallelogram has both pairs of opposite sides equal and opposite angles equal. These are standard identifying properties.