Understanding Perimeter and Hash Marks

This video tutorial teaches how to find the perimeter of a polygon using grid paper. It begins by explaining the difference between area and perimeter, highlighting common mistakes such as confusing the two or counting whole square units instead of side lengths. The tutorial then demonstrates how to measure perimeter by counting the side lengths of square units, using hash marks for accuracy. An example is provided to illustrate the process, and the lesson concludes with a recap of the key points.

What is a common mistake when discussing perimeter?

• Confusing it with volume

• Confusing it with area

• Counting the number of vertices

• Ignoring the shape's color

How does perimeter differ from area?

• Perimeter is measured in cubic units

• Perimeter measures the distance around a shape

• Perimeter is always larger than area

• Perimeter measures the space inside a shape

How do you measure the perimeter of a polygon on grid paper?

• By counting the number of squares inside

• By measuring the diagonal of the polygon

• By adding the number of vertices

• By counting the side lengths of the square units

What should you avoid counting when measuring perimeter?

• The number of sides

• The number of vertices

• The color of the shape

• The whole square unit

What is the first step in finding the perimeter of a polygon on grid paper?

• Counting the side lengths of the square units

• Measuring the diagonal

• Identifying the shape's color

• Counting the number of vertices

What is the purpose of using hash marks when finding the perimeter?

• To keep track of the side lengths counted

• To measure the height of the polygon

• To mark the area inside the polygon

• To count the number of vertices

If a side of a polygon has three hash marks, what does it indicate?

• The area is three square units

• The side length is three units

• The polygon has three sides

• The perimeter is three units

What is the perimeter of a rectangle if there are 14 hash marks around it?

• 14 square units

• 14 units

• 28 units

• 7 units

What is the final step in finding the perimeter of a polygon using hash marks?

• Counting the number of vertices

• Adding up all the hash marks

• Measuring the diagonal

• Calculating the area

What is the key takeaway from the lesson on perimeter?

• Perimeter is the same as area

• Perimeter is the distance around a polygon

• Perimeter is measured in square units

• Perimeter is only applicable to circles