Skip to content
START WITH A QUESTION

What would you like to understand?

Find an answer. See the moment it becomes clear. Follow the idea further.

← Concept directory

Answers for “我相加边长的顺序会影响周长吗?”

3 keyword matches

Understanding your question. You can explore the search results below now.

Understand why

↗

No, the order of addition does not matter. You get the correct perimeter regardless of the sequence in which you add the side lengths, because they are the same set of numbers being summed.

Conditions: The same set of side lengths is being summed.; Addition is ordinary real-number addition.

Meet the concept

↗

Perimeter is defined as the total distance around the outside boundary of a shape. In the video's example, this is demonstrated by tracing the full outer edge of a rectangle.

Conditions: Applies to closed shapes such as the rectangle shown.; In this video, the example uses feet as the unit of measure.

Find a method

↗

To calculate the perimeter of a rectangle, add the lengths of all four of its sides. For the rectangle shown, the side lengths are 2 ft, 6 ft, 2 ft, and 6 ft, giving the expression P=2+6+2+6P = 2 + 6 + 2 + 6.

Conditions: Use all side lengths of the shape.; Units must be consistent; here all lengths are in feet.