Question

Farida notices that from the side, even a cylinder looks like a circle. She wants to measure the circumference of the circle. She applies some black paint along a straight line on the cylinder (fig. I) and sets the cylinder rolling in a straight line on a paper. The pattern she obtains on the paper is shown in fig. II. Distance between which two points marked on the pattern will give her the circumference of the circle of this cylinder? a) 1 and 4 b) 2 and 3 c) ONLY 1 and 3 d) ONLY 2 and 4

Answer 1

Answer:

So all the cans we have in our houses are cylinders. Columns are another real world example of cylinders.

How do we find a cylinder's surface area?

When we determine a cylinder's surface area, we're really adding together the area of the top and bottom circles and the area of the rectangle that forms the cylinder's side.

The sum of the areas of the two circles and the rectangle is:

Formula for the surface area of a cylinder

By combining like-terms, we can simplify this equation to:

The surface area of a cylinder equals 2 pi r times r plus h

Here, A is equal to area, pi is equal to 3.14, r is equal to the radius, and h is equal to the height.

Answer 2

Step-by-step explanation:

• Farida notices that from the side, even a cylinder looks like a circle.
• She wants to measure the circumference of the circle.
• She applies some black paint along a straight line on the cylinder (fig. I) and sets the cylinder rolling in a straight line on a paper.
• The pattern she obtains on the paper is shown in fig. II. Distance between which two points marked on the pattern will give her the circumference of the circle of this cylinder
• Answer is option (b) ....