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प्रश्न
- Find the length of the boundary of square D.
- 8 squares of side 1 cm are cut out of the square D. Now it looks like shape E. What is the length of the boundary of shape E?
- The boundary of this
is ______ + ______ + ______ + ______
Can we also say that the boundary is 4 × 1 cm?
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उत्तर
- The boundary of shape D = 5 cm + 5 cm + 5 cm + 5 cm = 20 cm
- There are 21 edges measuring 1 cm of shape ‘E’.
Hence, the boundary of shape ‘E’ = 1 cm x 21 = 21 cm - The boundary = 1 cm + 1 cm + 1 cm + 1 cm = 4 cm
So, we can say the boundary of = 4 × 1 cm.
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संबंधित प्रश्न
How much wire did Rahmat give to Ganpat?
Ganpat thanked Rahmat and started fencing his own field. But he needed to get more wire.
How long is the boundary of Ganpat’s field?
Chandu’s father is called the ‘young old man’ in his village. At 70 years of age, he is fully fit. Do you know his secret? He goes for a walk around the field every morning. Everyday he takes four rounds of Chandu’s field.
What is the total distance he covers?
4 × ______ = ______ m = ______ km
Ganpat’s wife works in a tailor’s shop. She has to fix lace around a table cloth.
She bought a 100 metre roll of lace.
Look at the picture of the table cloth and tell how much lace is used for one table cloth.
How much lace will be used in 3 such table cloths?
- How many different shapes can you make by joining two squares? Draw them on the squared sheet given below. How long is the boundary of each shape?
- Try this activity with three squares also.
A square has a boundary of 12 cm.
- From the corner of this square, a small square of side 1 cm is cut off. Will the boundary of B be less or more? Find its length.
- If you cut a 1 cm square to get shape C, what will be the length of the boundary of C?
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| Square | New shape |
How will Neetu find out if the two gardens are equally big?
- Which is the biggest leaf in this picture?
- Collect some leaves from the
garden. Place each of them here on this squared sheet. Trace out their edges and check how many squares there are in each leaf. - Which is the biggest leaf?
- Which is the smallest leaf?
- How many small squares of size 1 cm are there in this big green square?
- Can you think of a faster way to know the total number of small squares without counting each.
