CBSE Class 4 Maths Revision Worksheet Set 21

Tell whether the dotted line on each shape represents a line of symmetry. Write yes or no.

Question 1(a). [Shape a]
Answer: Yes
In simple words: The dotted horizontal line divides the candy wrapper shape into two identical halves that match perfectly when folded.

Exam Tip: A line of symmetry cuts a figure into two identical mirror images.

Question 1(b). [Shape b]
Answer: No
In simple words: The dotted line goes diagonally across the complex star shape, but the parts on either side do not match.

Exam Tip: Always check if folding along the dotted line makes both sides overlap completely.

Question 1(c). [Shape c]
Answer: Yes
In simple words: The dotted line goes from the top-left corner to the bottom-right corner of the rectangle, dividing it into two identical triangles.

Question 1(d). [Shape d]
Answer: Yes
In simple words: The vertical dotted line divides the house-like shape into two identical left and right halves.

Exam Tip: Look for mirror-image halves on the left and right of a vertical line.

Question 1(e). [Shape e]
Answer: Yes
In simple words: The horizontal dotted line divides the letter E into a top half and a bottom half that are mirror images of each other.

Exam Tip: Capital letter E has a horizontal line of symmetry.

Question 1(f). [Shape f]
Answer: No
In simple words: The vertical dotted line cuts through an asymmetrical figure where the left and right sides do not match.

Exam Tip: Verify that corresponding points are at the same distance from the symmetry line.

Question 1(g). [Shape g]
Answer: Yes
In simple words: The vertical line passing through the peak of the triangle divides it into two equal right-angled triangles.

Exam Tip: An isosceles triangle has one vertical line of symmetry from its vertex to its base.

Question 1(h). [Shape h]
Answer: Yes
In simple words: The dotted line is a diameter of the circle, which always divides it into two identical halves.

Exam Tip: Any line passing through the center of a circle is a line of symmetry.

Question 1(i). [Shape i]
Answer: Yes
In simple words: The horizontal dotted line divides the trapezoid shape into two matching top and bottom halves.

Exam Tip: Check if folding along the line aligns the top and bottom edges.

Question 1(j). [Shape j]
Answer: No
Answer: No
In simple words: The dotted line passing diagonally across the hexagon does not create two identical halves.

Exam Tip: A regular hexagon's lines of symmetry must connect opposite vertices or opposite side midpoints.

Question 1(k). [Shape k]
Answer: Yes
In simple words: The vertical line down the middle cuts the complex symmetrical shape into two matching sides.

Exam Tip: Look for balanced structures on both sides of the central axis.

Question 1(l). [Shape l]
Answer: No
In simple words: The slanted line across the rectangle does not divide it into mirror-image halves because of the attached corner elements.

Question 2(a). [Curved letter shape]
Answer: Complete the curve by drawing the mirror image across the vertical dotted line.
In simple words: Reflect the left curved arc across the dotted line to form a complete curved symmetrical shape.

Exam Tip: Measure equal distances from the symmetry line for corresponding points.

Question 2(b). [Angle letter shape]
Answer: Complete the V-like or angle shape by drawing the matching reflected segment across the vertical dotted line.
In simple words: Mirror the sloped line across the center axis.

Exam Tip: Ensure angles are preserved in the mirror reflection.

Question 2(c). [Letter N]
Answer: Complete the right leg of the letter N across the vertical dotted line.
In simple words: Draw the missing diagonal and vertical stem to complete the letter N symmetrically.

Exam Tip: Keep line thickness and slant consistent.

Question 2(d). [Letter A]
Answer: Complete the right slanting stroke and crossbar of the letter A across the vertical dotted line.
In simple words: Draw the matching right side of the letter A.

Exam Tip: Capital A is symmetric along a vertical line passing through its apex.

The pictures on the left have been folded on a line of symmetry. Circle the shape you would see when each paper is unfolded.

Question 3(a). [First folded shape]
Answer: Option (b)
In simple words: Unfolding the paper along the vertical dotted line mirrors the cut-out shape to form a complete symmetrical figure with outward pointing notches.

Exam Tip: Visualize opening the folded edge like a book to see the full design.

Question 3(b). [Second folded shape]
Answer: Option (c)
In simple words: Unfolding the paper reveals the complete symmetric pattern corresponding to the cut design.

Exam Tip: Match the orientation of the folds with the options provided.