When finding the perimeter of a figure on a grid,
why do you not count the spaces inside the grid?
You are not counting right.
The perimeter is the distance around something.
Study this site.
http://www.mathsisfun.com/geometry/perimeter.html
Dad
When finding the perimeter of a figure on a grid, we do not count the spaces inside the grid because the perimeter represents the total length around the figure, which defines its boundary. The spaces inside the grid do not contribute to the boundary because they are part of the interior of the figure and not the outer edge.
To find the perimeter of a figure on a grid, you need to identify the outermost points of the figure and measure the lengths of the sides that connect those points. This typically involves counting the number of grid lines crossed along each side and then summing those lengths.
Here's a step-by-step process to find the perimeter of a figure on a grid:
1. Identify the outermost points of the figure.
- Look for the vertices or corners of the figure that define its shape.
2. Count the number of grid lines crossed on each side.
- Start from one vertex and count the number of horizontal or vertical grid lines crossed until you reach the next vertex.
- Repeat this for each side of the figure.
3. Sum the lengths of all the sides.
- Add up the lengths obtained from counting the grid lines crossed on each side.
The resulting sum will give you the perimeter of the figure, which represents the total distance around its boundary. Remember to disregard the spaces inside the grid as they are not part of the perimeter.