Question 100

A circle with radius 16 cm is cut into four equal parts and rearranged to form another shape as shown in the figure below.

Does the perimeter change? If it does change, by how much does it increase or decrease?

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Solution

Yes, the perimeter changes. The perimeter is increased by $2 r = 2 \times 16 = 32 c m$ .

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Question 2

Discuss:

(a) Riya pours some water from her bottle into another bottle. Does it change the shape of the water?

(b) Halima picks up a small stone from the ground and puts it in the water in a dish. Does the shape of the stone change?

If the radius of the earth shrinks by 4% and there is no change in its mass. By how much does the value of `g’ change?

If the length and breadth of a rectangle are doubled, how does its perimeter change?

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