The perimeter of the sun would be calculated as the perimeter (circumference) of a circle which is derived by multiplying 'pi' (3.14) by the diameter. The Sun's diameter is 1.4 million kilometers. Therefore, the circumference of the sun is 3.14 multiplied by 1.4 million which is equal to 4.396 million km.
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270.45378502 PI* 10**8 = 427316 miles (i think)
perimeter.
fixed perimeter is the perimeter being fixed
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!
Semi-perimeter means half the perimeter. Calculate the perimeter, then divide that by 2 to get the semi-perimeter.