To find the area of a book cover in metric units, the most appropriate unit to use would be centimeters. The formula for finding the area of a book cover would be: length x width.
Square metres
The square meter is the metric (International) unit of area. Google gives 1 acre as 4046.86 sq. meters.
The metric unit for distance/length is the metre, but what kind of formula are you asking for?
Surface area is measured in square units, the exact unit is given with the dimensions. For example, if the dimensions for a rectangular prism are 1cm by 1cm by 1cm, then the surface area is 6 square cm.The above does not answer the question asked. Nor can it. The question asks for units and there is no such thing as a square unit. You can square a unit of measurement, but that is different.A unit of measurement is determined by the system of measurement used and then determined from there. So before you can determine the unit, you have to ask what system are you using. The most universal form would be metric so you'd be working with meters and its variants such as the milliliter, centimeter, decimeter, and so on. Or, as we still do in the USA you could be using the Imperial standard in which case you're looking at inches, feet, yards, etc. Which to chose is based on the total area, as well as other information not provided in your question.
Square centimetres (cm2).
Any square unit you like can be used to measure the area of a postcard, however to make the numbers have a reasonable size and ease of handling, I would suggest using square centimetres as a postcard is about hand size (and likely to be about 15cm by 10cm).
I would use the metric unit is inches
no, Acres is an Imperial Unit for the measure of area. The metric unit for area is the square meter.
metres
metres
centimeter
The metric unit of the meter would be the appropriate measure of the area of classroom. Calculating area involves multiplying the length (in meters) of the classroom's length and width. Area of the classroom would be in square (^2) meters.
To find the area of a book cover in metric units, the most appropriate unit to use would be centimeters. The formula for finding the area of a book cover would be: length x width.
square meter
Square meters.
Square metres