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It is pi, a letter of the Greek alphabet, not pie!.
sin(3*pi/4) = 1/sqrt(2) = sqrt(2)/2
Sine(120) = sqrt(3/4) or sqrt(3)/2 = 0.866025
What you do is, diameter divided by two, then multiply the diamter already divided in half multiplying by itself, then you would times the squared radius by pie(3.14) Example; diameter is 6 divided in half equals 2 because 6 divided by 3 equals two then spuare it which will be 4, then times it by pie or 3.14 :):):):):):):):):):):):):):):):)
Any fraction that has a smaller divisor. One ninth, for example. Let me explain using a pie! One half of the pie would be expressed as 1/2 of the pie. One quarter of the pie would be expressed as 1/4 of the pie Three quarters of the pie would be expressed as 3/4 of the pie Taking these examples note that there are two parts of a fraction ... the bottom number or divisor and the top number or numerator. The concept of fractions is that something is divided into a number of equal parts: 2 for halves 3 for thirds, four for quarters, five for fifths, and so on. That number is represented by the divisor - the bottom number. The numerator, or top number tells you how many of those parts we're talking about So your fraction ... one tenth equals 1/10 of something(say the pie). One of the pieces when something is divided into ten equal parts, Obviously, if I divided the pie into a smaller number of parts, say nine (1/9) one part would be bigger. The case of 3/4 says divide the pie into 4 equal parts and I'll have 3 of them! The divisor is 4 and the numerator is 3
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