Question

Which of the following open shapes can be joined together to form a closed shape?

Shape 1	Shape 2	Shape 3

• A. Shapes 2 and 3
• B. Shapes 1 and 3
• C. Shapes 1 and 2
• D. None of the given shapes

Answer 1

The correct option is B Shapes 1 and 3

$\text{Say:}$Let’s read the question and observe the given images.

$\text{Ask:}$
$\bullet$ By looking at the given shapes, can you tell me which 2D shape are these shapes a part of?
Ans: The shapes are part of a circle.

$\bullet$ Do you think shapes 1 and 2 can be joined to make a closed shape? Why?
Ans: No, because if you join them, it does not make a closed shape, i.e., a circle.

$\bullet$ Can we join shapes 2 and 3 to make a closed shape?
Ans: No, because similar to shape 1 shape 3, it does not make a closed shape, i.e., a circle.

$\bullet$ Can we join shapes 1 and 3 to make a closed shape?
Ans: Yes, because shape 1 and shape 3 are two parts of a circle divided vertically.

Hence, Option C is the correct answer.

$\text{WB:}$If required, use the whiteboard to draw the possible combinations of the given options to find the correct combination as shown.



$\text{Error Analysis Question:}$As all the 3 given shapes are made of curved lines, a straight line cannot be used to close the shapes. Is this true? Why?
A: No, though the given shapes are made of curved lines, we can use horizontal and vertical lines to close the shapes.