It's a Prime number only 1 and 89 can go into it (:
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You either keep it as "89 pi" to have the exact value, or you take the desired number of decimals for pi (depending on the desired precision), for example 3.14, or 3.1416, and then multiply.
Simple maths... Divide the 89 & 68 by 2, then multiply both of the answers together - OR multiply the 89 & 68 together, then divide that answer by 4 ! I'll leave you to do the calculations.
The number 89 is a prime number, which means it is only divisible by 1 and itself. In other words, the only numbers that can go into 89 without leaving a remainder are 1 and 89. This is because 89 does not have any other factors besides these two.
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