Samacheer Kalvi Class 5 Maths Solutions Term 1 Chapter 1 Geometry Exercise 1.2

Question 1. Among the following shapes, find out which one would look the same after one-fourth turn. Put a (✔) mark.
Answer:The shapes that look the same after a one-fourth turn (90 degrees rotation) are the four-petal flower, the circle, the plus sign, and the diamond (assuming it's a square-like diamond). A one-fourth turn means turning the object by 90 degrees. Some shapes have symmetry that makes them appear identical after such a turn.
In simple words: When you spin some shapes by a quarter turn, they look exactly the same as before. These include the flower, circle, plus sign, and the diamond.

🎯 Exam Tip: Remember that a "one-fourth turn" means rotating an object by 90 degrees. Visualize or physically rotate the shapes to check for symmetry.

Question 2. Among the following letters, find out which one would look same after half turn.
(X, H, A, N, B, O, J, I, D, S)
Answer: The letters that would look the same after a half-turn (180 degrees rotation) are X, H, N, O, I, S. A half-turn means turning the letter upside down. Letters like A, B, D, J do not look the same when rotated 180 degrees.
In simple words: If you turn these letters (X, H, N, O, I, S) completely upside down, they will still look exactly the same.

🎯 Exam Tip: Imagine rotating each letter on its center point by 180 degrees. Letters with point symmetry will look the same.

Question 3. Find the numbers which will look same on a half-turn
(1, 2, 3, 4, 5, 0, 8)
Answer: The numbers that will look the same after a half-turn (180 degrees rotation) are 1, 0, and 8. These digits have rotational symmetry, meaning they appear unchanged when flipped upside down. Other digits like 2, 3, 4, and 5 change their appearance or become unrecognizable when rotated 180 degrees.
In simple words: When you flip the numbers 1, 0, and 8 upside down, they still look like 1, 0, and 8. Other numbers change.

🎯 Exam Tip: Practice writing numbers and then rotating the paper 180 degrees to easily identify which ones remain the same.

Question 4. How the following numbers are changed after half-turn
88888
10101
11111
80808
Answer: The numbers 88888, 10101, 11111, and 80808 will all look the same after a half-turn. This is because all the digits used in these numbers (0, 1, and 8) have rotational symmetry; they look identical when rotated 180 degrees. Therefore, when these numbers are turned upside down, their overall appearance does not change.
In simple words: If you turn numbers made only of 0s, 1s, and 8s upside down, they will look exactly the same. So, these numbers do not change after a half-turn.

🎯 Exam Tip: For multi-digit numbers, check if each individual digit has 180-degree rotational symmetry. If all digits do, the entire number will look the same after a half-turn.