NCERT Solutions for Class 4th Maths Chapter 11 . Complete the designs below — In-text Questions
Book page 1674 Updated on2026-09-19
Q1.
Complete the designs below. (the first design — half of the cross)The first design. Only half of it is drawn on the dot grid.
Answer
Only the top half is drawn. Complete it so that both halves match.
The half design given in the book, drawn on the dot grid.
How to do it: Take each corner of the given half, count how many dots it is above the middle row, and mark a new point the same number of dots below the middle row. Then join the new points.
The completed design. The dashed red line is the fold that was used to complete it.
The finished design is a cross shape. It has 4 lines of symmetry — one across, one down, and two along the slanting corners.
Why it happens: Counting dots on both sides of the fold line keeps the two halves exactly the same size and shape.
Q2.
Complete the designs below. (the second design — half of the star)The second design. Only half of it is drawn on the dot grid.
Answer
Here the left half is drawn. The fold line goes straight down the middle this time.
The half design given in the book, drawn on the dot grid.
How to do it: Count how many dots each corner lies to the left of the middle column, and mark the matching point the same number of dots to the right. Join them in the same order.
The completed design — an eight-pointed star. The dashed red line is the fold that was used.
The finished design is an eight-pointed star. It has 4 lines of symmetry.
Why it happens: Each point on the left is copied at the same distance on the right, so the star folds on to itself neatly.
Q3.
Complete the designs below. (the third design — half of the kolam)The third design. Only half of the kolam is drawn on the dot grid.
Answer
This one is a kolam (a dot design) made of loops. Only the loops on the left are drawn.
The half kolam given in the book, drawn on the dot grid.
How to do it: Draw the same loops on the right side of the middle column, turned the other way round, like a picture in a mirror.
The completed kolam, with the middle line shown dashed.
Why it happens: A loop and its mirror loop meet the same dots, so the two sides balance and the kolam looks whole.
Tip: The full kolam printed at the top of the page has one more pair of loops — one above and one below. Add them if you want four matching sides.