Test: Basic Geometrical Ideas - Class 6 MCQ

To fix a line in a plane, you need 2 points. Here's why:

- Two distinct points uniquely determine a line in a plane.
- If you have 1 point, you can draw infinite lines passing through it.
- With 3 or more points, you risk creating inconsistencies or unnecessary complexity.

Therefore, the correct answer is A: 2 points.

To determine the number of lines that can pass through a single given point, consider the following:

• A line is defined by two points.
• Given one point, there is no restriction on the direction or slope a line can take through this point.
• Therefore, an infinite number of lines can pass through a single point.

Thus, the correct answer is A: Countless.

To determine the number of vertices in the figure, look at the points where two or more lines meet. Each of these points is considered a vertex.

• Identify all intersections of the edges in the figure.
• Count each intersection point (vertex).
  
   

Here, the diagonals are AD, AC, BD, BE, and CE. Totally there are 5 diagonals.

The correct answer is A: 3.

• A triangle is a polygon with three edges and three vertices.
• Each corner point of a triangle is called a vertex.

Explanation:

A triangle is a basic geometric shape defined by three straight lines that connect three points.These points where the lines meet are called vertices. 

• Each vertex forms an angle.  
• Since there are three vertices, there are three angles in a triangle. As shown in the figure (α, β, and γ)

The correct answer is D: 4.

- A quadrilateral is a polygon.
- The prefix "quadri-" means four, indicating the number of sides.
- Examples include squares, rectangles, and trapezoids.
- Each quadrilateral has:
- Four sides
- Four vertices (corners)
- Four angles

Understanding the term "quadrilateral" helps identify it as a four-sided shape.

To determine how many angles are in a quadrilateral, consider the following points:

• - A quadrilateral is a polygon with four sides.
• - By definition, a polygon with four sides will have four vertices.
• - Each vertex in a polygon represents an angle.

Therefore, a quadrilateral has:
- 4 angles
 

To determine the false statement:

- A: Every chord of a circle is not always a diameter.
- B: The center of a circle is indeed always in its interior.
- C: Every diameter of a circle is indeed also a chord.
- D: Two diameters of a circle will never intersect; they are parallel.

The false statement is A: "Every chord of a circle is also a diameter." This is untrue because a chord may or may not pass through the center of a circle, unlike a diameter.

To determine how many sides the figure has, examine the image provided. The shape depicted is a hexagon.

- A hexagon is defined as a polygon with six sides.
- The prefix "hexa-" in Greek means six, indicating the number of sides in the shape.