To find the ratio of the length of a shape to its perimeter, you would divide the length by the perimeter. For example, if the length of a rectangle is 4 units and its perimeter is 12 units, the ratio would be 4/12 or 1/3. This ratio represents the proportion of the length to the total distance around the shape.
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Here's how to do that:
1). Find its length.
2). Find its perimeter.
3). Divide (its length) by (its perimeter). The quotient is the ratio of its length to its perimeter.
It is: 1 to 4
4 to 1.
The width is half the length: The perimeter is twice the length plus twice the width. If the perimeter is 3 times the length, twice the width must be the length.
The question is not specific enough for a sensible answer. It could refer to the ratio of the area of the shape to its perimeter or depending on its shape, the ratio of the area to the length of one or more of its sides.
perimeter = 2 x (length + width) ⇒ length + width = perimeter ÷ 2 ⇒ length = (perimeter ÷ 2) - width So to find the length of the given rectangle, subtract the width from half the perimeter is how to do it. IF you meant "What is the length..." then: length = perimeter ÷ 2 - width = 40 ÷ 2 - 2 in = 20 - 2 in = 18 in