CBSE Class 3 Mathematics Assignment Set 08

Question 1. Fill in the blanks:
a. Square has 4 corners and 4 sides.
Answer: 4, 4
In simple words: A square is a 4-sided flat shape with 4 corners (vertices) of equal length.

Exam Tip: Remember that all 4 sides of a square are equal in length and all 4 corners are right angles.

Question 1. b. Circle has 0 Corners and 0 sides.
Answer: 0, 0
In simple words: A circle is a round shape with a continuous curved line and no straight sides or corners.

Exam Tip: A circle is a curved 2D shape, so it has zero vertices and zero straight sides.

Question 1. c. Triangle has 3 corners and 3 sides.
Answer: Triangle
In simple words: A polygon with three straight sides and three corners is called a triangle.

Exam Tip: The prefix 'tri' means three, which helps you remember triangles have 3 sides and 3 corners.

Question 1. d. A ray has 1 end points.
Answer: 1
In simple words: A ray starts at one fixed point and extends endlessly in one direction.

Exam Tip: A ray has one starting endpoint and goes on forever on the other side (indicated by an arrow).

Question 1. e. A line segment has 2 end points.
Answer: 2
In simple words: A line segment is a part of a line with two distinct endpoints.

Exam Tip: Because a line segment has two endpoints, it can be measured with a ruler.

Question 1. f. A cube has 12 straight edges and 8 vertices.
Answer: 12, 8
In simple words: A 3D solid like a cube has 6 square faces, 12 edges, and 8 corners (vertices).

Exam Tip: Cube, cuboid, and other rectangular prisms share the exact same number of faces, edges, and vertices.

Question 1. g. A sphere has 1 curved edge and 0 vertex.
Answer: 1 (curved), 0
In simple words: A sphere is a perfectly round 3D object with one continuous curved surface and no sharp corners.

Question 1. h. Two figures are said to be congruent when they have same shape and size.
Answer: shape, size
In simple words: Congruent figures are exact twins of each other in every dimension.

Exam Tip: If you can place one figure on top of another and cover it completely, they are congruent.

Question 1. i. Figures that start and end at the same point are called closed figures.
Answer: closed figures
In simple words: A figure that loops back to touch its starting point encloses an area inside it.

Exam Tip: Think of a closed figure as a fence that completely traps whatever is inside.

Question 1. j. Figures that start at one point and end at another point are called open figures.
Answer: open figures
In simple words: An open figure has two separate ends and does not enclose an area.

Exam Tip: Open figures have a distinct beginning and ending point that do not meet.

Question 2. Draw following line segments that measures:
a. 6 cm
Answer:
1. Place a ruler on a flat surface.
2. Mark a starting point at the 0 cm mark.
3. Mark an ending point at the 6 cm mark.
4. Join both points with a straight line using a pencil.
In simple words: Draw a straight line starting at 0 cm and stopping at 6 cm on a ruler.

Exam Tip: Always align your starting point precisely with 0 on the ruler, not the edge of the plastic.

Question 2. b. 8 cm
Answer:
1. Place a ruler on your paper.
2. Mark point A at 0 cm and point B at 8 cm.
3. Draw a straight line connecting A and B.
In simple words: A straight line measuring exactly 8 centimeters from end to end.

Exam Tip: Double-check your endpoints against the ruler markings before finishing the line.

Question 2. c. 3 cm
Answer:
1. Place the ruler firmly on the page.
2. Make a dot at 0 cm and another dot at 3 cm.
3. Draw a straight line connecting the two dots.
In simple words: A short straight line measuring 3 centimeters.

A B 3 cm

Question 3. Complete the following table:
Answer:
Here is the completed table showing the properties of 3D geometric shapes:

In simple words: 3D shapes are described by counting how many flat or curved faces, edges, and corners they possess.

Exam Tip: Memorize these numbers as they are frequently tested in geometry property questions.

Question 4. Colour the closed figures:
Answer:
1. Examine each figure to see if it forms a complete enclosed boundary without any gaps.
2. The cloud shape starts and ends at the same point (Closed Figure - Colour this).
3. The open curved hook shape has two separate open ends (Open Figure - Do not colour).
4. The scribble line at the bottom wanders around without closing (Open Figure - Do not colour).
5. The Pac-Man / curved wedge shape is completely enclosed (Closed Figure - Colour this).
6. The hourglass / double triangle shape is completely enclosed by intersecting lines (Closed Figure - Colour this).
In simple words: Identify and shade the shapes that have a completely closed boundary (cloud, curved wedge, and hourglass figures).

Exam Tip: Trace your finger along the outline of each shape; if your finger returns to where it started without lifting or hitting an open end, it is a closed figure.