The four countries that still use coins with holes in them are Japan, South Korea, the Philippines, and Indonesia. These coins are known as "holey coins" and are typically used for denominations of 1 yen, 5 won, 1 piso, and 50 rupiah respectively. The holes in these coins serve both functional and symbolic purposes, such as making it easier to string them together or representing the country's cultural heritage.
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Two in many countries: 0.25 and 0.10.
Originally coins were different sizes because their values were determined by how much metal they contained. For example, a US dime had roughly 10 cents worth of silver in it, a British sovereign had roughly a pound's worth of gold, etc. People could associate a coin's value with its size, making it easy to tell them apart. Even though circulating coins today don't have any precious metals in them, different sizes still help people to easily distinguish one coin from another without looking at its design or denomination. Having different sizes also facilitates the use of mechanical sorting equipment. Mixed coins are passed through a kind of filter with holes of increasing sizes. The smallest coins drop through the smallest holes first, the next size coins drop through the second set of holes, and so on, and are collected in bins.
There are many countries which use cents as their minor currency units and these coins are not all the same size. With no information as to which county's coins the question is about, it is impossible to give an answer.
Most countries indicate the value of coins through a combination of visual elements such as numbers, symbols, and images. These visual elements are typically printed or stamped onto the coins themselves to denote their denomination. Additionally, countries may use different sizes, shapes, and colors for coins of varying values to help distinguish them easily in everyday transactions. Lastly, some countries may also include text in the form of words or abbreviations to further clarify the value of the coins.
Many countries use 25 cent coins and they are not the same size. Since you have not specified which county's currency you are asking about, I cannot provide a more useful answer.