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What is the diameter of a 21-inch umbrella?
Date：2023-10-12
Usually, a 21-inch umbrella (or 21-inch umbrella) refers to the diameter of the umbrella surface. A standard 21-inch umbrella has a canopy diameter of about 90-100 centimeters (35-39 inches). The exact diameter may vary slightly, depending on the manufacturer, design and brand.
Such an umbrella can usually provide enough shade and rain coverage for an adult, protecting the head and upper body from rainfall and sunlight. Umbrellas of this size are also easier to carry and suitable for daily use.
Inch and cun are both units of length, but they come from different measurement systems and have different definitions and conversion relationships:
Inch:
The inch is an imperial unit of length commonly used to measure small lengths. 1 inch equals 25.4 millimeters or 2.54 centimeters.
Inch (cun):
Cun is a traditional Chinese unit of length, usually used to measure small lengths. 1 inch is equal to 10 centimeters, and 1 minute is equal to 10 centimeters, so 1 inch is equal to 10 centimeters.
In other words, 1 inch is approximately equal to 2.54 centimeters or 0.0254 meters. In the traditional Chinese measurement system, 1 inch equals 2.5 centimeters.
Compared:
1 inch ≈ 2.54 centimeters or 0.0254 meters
1 inch ≈ 2.5 cm
It should be noted that in actual use, inches are often used as the main unit of length in imperial countries, while inches in the traditional Chinese system are relatively rare in modern use, and metric units such as centimeters are more common.
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