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2D Shapes and Perimeter
Introduction
Attributes of 2D Shapes
Using Attributes of 2D Shapes to Find Perimeter
Relating Perimeter and Area

Chia sẻ

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Thao tác này sẽ xóa tiến trình và dữ liệu trò chuyện của bạn cho tất cả các chương trong khóa học này và không thể hoàn tác!

Bảng chú giải

Area
Interval
Perimeter
Quadrilateral
Rectangle
Rhombus
Square

Chọn một trong những từ khóa bên trái

2D Shapes and PerimeterRelating Perimeter and Area

Thời gian đọc: ~10 min

As students solve problems relating perimeter

The perimeter of a shape is the length of its boundary, or outside.

and area

The area measures the size of the surface of a 2-dimensional shape. If a closed figure can be packed with n unit squares without gaps or overlap, we say that it has an area of n square units.

, they begin to see that shapes that have the same perimeter can have different areas. They also see that shapes that have the same areas can have different perimeters.

Try these activities by entering some correct and incorrect values, to see what students will experience! Click on each of the images below to try it.

It is important that students understand the differences and relationships between area and perimeter. Let’s think through five examples that highlight the difference between the two for students.

  1. If we need to know how much carpet to buy to for our living room floor, we would need to find the ???
     of our living room floor.
  2. If we need to know how much ribbon we need to decorate the outside a mirror, we would need to find the ???
     of the mirror.
  3. If we need to know much fencing is needed to surround a field, we would need to find the ???
     of the field.
  4. If we need to determine how much coastline there is of an island, we would need to find the ???
     of the island.
  5. If we need to know how much material is needed to replace the floor of a gym, we would need to find the ???
     of the gym.

Try it! What are the possible solutions your students might come up with?

Archie